Dionysius did not use AD years to date any historical event. This began with the English cleric Bede (c. 672–735), who used AD years in his Historia ecclesiastica gentis Anglorum (731), popularizing the era. Bede also used a term similar to the English before Christ once, but that practice did not catch on until very much later. Bede did not sequentially number days of the month, weeks of the year, or months of the year. However, he did number many of the days of the week using a counting origin of one in Ecclesiastical Latin. Previous Christian histories used anno mundi ("in the year of the world") beginning on the first day of creation, or anno Adami ("in the year of Adam") beginning at the creation of Adam five days later (the sixth day of creation according to the Genesis creation narrative), used by Africanus, or anno Abrahami ("in the year of Abraham") beginning 3,412 years after Creation according to the Septuagint, used by Eusebius of Caesarea, all of which assigned "one" to the year beginning at Creation, or the creation of Adam, or the birth of Abraham, respectively. Bede continued this earlier tradition relative to the AD era.

In chapter II of book I of Ecclesiastical history, Bede stated that Julius Caesar invaded Britain "in the year 693 after the building of Rome, but the sixtieth year before the incarnation of our Lord", while stating in chapter III, "in the year of Rome 798, Claudius" also invaded Britain and "within a very few days … concluded the war in … the fortysixth [year] from the incarnation of our Lord".[2] Although both dates are wrong, they are sufficient to conclude that Bede did not include a year zero between BC and AD: 798 − 693 + 1 (because the years are inclusive) = 106, but 60 + 46 = 106, which leaves no room for a year zero. The modern English term "before Christ" (BC) is only a rough equivalent, not a direct translation, of Bede's Latin phrase ante incarnationis dominicae tempus ("before the time of the lord's incarnation"), which was itself never abbreviated. Bede's singular use of 'BC' continued to be used sporadically throughout the Middle Ages.

Bede did not use a year zero because neither the concept nor a symbol for it existed in the system of Roman numerals. The Babylonian system of the BC era had used the idea of "nothingness" without considering it a number, and the Romans enumerated in much the same way. Wherever a modern zero would have been used, Bede and Dionysius Exiguus did use Latin number words, or the word nulla (meaning "nothing") alongside Roman numerals.[1][3][4] Zero was invented in India in the sixth century, and was either transferred or reinvented by the Arabs by about the eighth century. The Arabic numeral for zero (0) did not enter Europe until the thirteenth century. Even then, it was known only to very few, and only entered widespread use in Europe by the seventeenth century.

The anno Domini nomenclature was not widely used in Western Europe until the 9th century, and the 1 January to 31 December historical year was not uniform throughout Western Europe until 1752. The first extensive use (hundreds of times) of 'BC' occurred in Fasciculus Temporum by Werner Rolevinck in 1474, alongside years of the world (anno mundi).[5] The terms anno Domini, Dionysian era, Christian era, vulgar era, and common era were used interchangeably between the Renaissance and the 19th century, at least in Latin. But vulgar era was suppressed in English at the beginning of the 20th century after vulgar acquired the meaning of "offensively coarse", replacing its original meaning of "common" or "ordinary". Consequently, historians regard all these eras as equal.

Historians have never included a year zero. This means that between, for example, 1 January500 BC and 1 JanuaryAD 500, there are 999 years: 500 years BC, and 499 years AD preceding 500. In common usage anno Domini 1 is preceded by the year 1 BC, without an intervening year zero.[6] Thus the year 2017 actually signifies "the 2017th year". Neither the choice of calendar system (whether Julian or Gregorian) nor the era (Anno Domini or Common Era) determines whether a year zero will be used. If writers do not use the convention of their group (historians or astronomers), they must explicitly state whether they include a year 0 in their count of years, otherwise their historical dates will be misunderstood.[7]

Modern astronomers do not use years for intervals because years do not distinguish between common years and leap years, causing the resulting interval to be indeterminate in length, an approximation only. Nevertheless, since the 17th century,astronomers have redefined year numbering slightly to simplify calculations: 1 BC of the traditional Christian era, a leap year, was renumbered "zero". The numbering of years of the Anno Domini era remain unchanged, of positive value. Years Before Christ are of a negative value (or zero). Since the numeric values of years are unique integers, the designations "AD" and "BC" are useless (BC is misleading), and are generally omitted. Jacques Cassini, creator of the current method, explained:

The year 0 is that in which one supposes that Jesus Christ was born, which several chronologists mark 1 before the birth of Jesus Christ and which we marked 0, so that the sum of the years before and after Jesus Christ gives the interval which is between these years, and where numbers divisible by 4 mark the leap years as so many before or after Jesus Christ.

— Jacques Cassini, Tables astronomiques, 5, translated from French

In this quote, Cassini used "year" as both a calendar year and an instant before a year. He identified the calendar year 0 as the year during which Jesus was born (on the traditional date of 25 December), and as a calendar leap year divisible by 4 (having an extra day in February). But "the sum of years before and after Jesus Christ" referred to the years between a number of instants at the beginning of those years, including the beginning of year 0, identified by Cassini as "Jesus Christ", virtually identical to Kepler's "Christi". Consider the three instants ('years') labeled 1 avant Jesus-Christ, 0, 1 après Jesus-Christ by Cassini, which modern astronomers would label −1.0, 0.0, +1.0. Cassini specified that his end years must be added, so the interval between the instants (noon 1 January) 1 avant Jesus-Christ and 1 après Jesus-Christ is 1 + 1 = 2, but modern astronomers would subtract their 'years', +1.0 − (−1.0) = 2.0, which agrees with Cassini. The calendar years between these two instants would be 2 BC and 1 BC, leaving the calendar year 1 AD beginning at +1.0 outside the interval.

Originally, years were adjectives (1st year, second year, et cetera). This system is because, at the time, people did not know about 0. Cassini, being a mathematician, wanted 0. He may or may not have wanted 0-Time (a singularity of time), but he wanted to maintain the cycle of leap years. He defined the Year 0 as the year-long duration containing the leap year before the Year +4. Because the system is based on durations of time instead of a temporal singularity of 0-Time, the 0th year is unsigned. The years work thus:

…, Year −1, Year 0, Year +1, …,

Subunits of the year (months, days of the month, days of the week, hours, minutes, seconds, et al.) existed both before the calendar and before year 0, so roll forward in negative dates; instead of counting down to 0.

Astronomers use year numbers not only to identify a calendar year (when placed alongside a month and a day number) but also to identify a certain instant (known in astronomy as an epoch). To identify an instant, astronomers add a number of fractional decimal digits to the year number, as required for the desired precision: thus J2000.0 designates noon 2000 January 1 (Gregorian), and 1992.5 is exactly 7.5 years of 365.25 days each earlier, which is the instant 1992 July 2.125 (03:00) (Gregorian). Similarly, J1996.25 is 3.75 Julian years before J2000.0, which is the instant 1996 April 1.8125 (19:30), one-quarter of a year after the instant J1996.0 = 1996 January 1.5. In this notation, J0000.0 is noon of −1 December 19 (Julian), and J0001.0 is 18:00 on 0 December 18 (Julian). This astronomical notation is called Julian epoch and was introduced in 1984; before that time, astronomical year numbers with decimal fractions referred to Besselian years and were written without a letter prefix.[citation needed]

During the 19th century astronomers began to change from named eras to numerical signs, with some astronomers using BC/0/AD years while others used −/0/+ years. By the mid 20th century all astronomers were using −/0/+ years. Numerical signs effectively form a new era, reducing the confusion inherent in any date which uses an astronomical year with an era named Before Christ.

In 1849 the English astronomer John Herschel invented Julian dates, which are a sequence of numbered days and fractions thereof since noon 1 January −4712(4713 BC), which was Julian date 0.0. Julian dates count the days between two instants, automatically accounting for years with different lengths, while allowing for any arbitrary precision by including as many fractional decimal digits as necessary. The modern mathematical astronomer Jean Meeus no longer mentions determining intervals via years, stating:[8]

The astronomical counting of the negative years is the only one suitable for arithmetical purpose. For example, in the historical practice of counting, the rule of divisibility by 4 revealing the Julian leap-years no longer exists; these years are, indeed, 1, 5, 9, 13, ... B.C. In the astronomical sequence, however, these leap-years are called 0, −4, −8, −12 ..., and the rule of divisibility by 4 subsists.

— Jean Meeus, Astronomical algorithms

In 1627, the German astronomer Johannes Kepler first used an astronomical year which was to become year zero in his Rudolphine Tables. He labeled the year Christi and inserted it between years labeled Ante Christum (BC) and Post Christum (AD) on the mean motion pages of the Sun, Moon, and planets.[9] Then in 1702 the French astronomer Philippe de la Hire used a year he labeled Christum 0 at the end of years labeled ante Christum (BC), immediately before years labeled post Christum (AD) on the mean motion pages in his Tabulæ Astronomicæ, thus adding the designation 0 to Kepler's Christi.[10] Finally, in 1740 the French astronomer Jacques Cassini(Cassini II), who is traditionally credited with the invention of year zero,[11] completed the transition in his Tables astronomiques, simply labeling this year 0, which he placed at the end of years labeled avant Jesus-Christ (BC), immediately before years labeled après Jesus-Christ (AD).[12]

ISO 8601:2004 (and previously ISO 8601:2000, but not ISO 8601:1988) explicitly uses astronomical year numbering in its date reference systems. Because it also specifies the use of the proleptic Gregorian calendar for all years before 1582, some readers incorrectly assume that a year zero is also included in that proleptic calendar, but it is not used with the BC/AD era. The "basic" format for year 0 is the four-digit form 0000, which equals the historical year 1 BC. Several "expanded" formats are possible: −0000 and +0000, as well as five- and six-digit versions. Earlier years are also negative four-, five- or six-digit years, which have an absolute value one less than the equivalent BC year, hence -0001 = 2 BC. Because only ISO 646 (7-bit ASCII) characters are allowed by ISO 8601, the minus sign is represented by a hyphen-minus.

All eras used with Hindu and Buddhist calendars, such as the Saka era or the Kali Yuga, begin with the year 0. All these calendars use elapsed, expired, or complete years, in contrast with most other calendars which use current years. A complete year had not yet elapsed for any date in the initial year of the epoch, thus the number 1 cannot be used. Instead, during the first year the indication of 0 years (elapsed) is given in order to show that the epoch is less than 1 year old. This is similar to the Western method of stating a person's age – people do not reach age one until one year has elapsed since birth (but their age during the year beginning at birth is specified in months or fractional years, not as age zero). However, if ages were specified in years and months, such a person would be said to be, for example, 0 years and 6 months or 0.5 years old. This is analogous to the way time is shown on a 24-hour clock: during the first hour of a day, the time elapsed is 0 hours, n minutes.

The 1985 film Back to the Future, character Doc Brown inputs the date 25 December 0000 on the time circuit's display of the DeLorean time machine as a joke and example of choice for witnessing the birth of Christ.

In the Seinfeld episode "The Millennium", Jerry notifies Newman there was no year 0. Since Newman had set up a party for the "Millennium New Year," the party would actually fall on 31 December 2000/1 January 2001, and thus his party will be late and "quite lame". Newman then squawks with frustration.

In the alternate history novel The Probability Broach by L. Neil Smith, in which the United States becomes a libertarian state after a successful Whiskey Rebellion and the overthrowing and execution of George Washington by firing squad for treason in 1794, Thomas Jefferson proposes a new calendar system to mark Albert Gallatin's ascension to the presidency. However, Gallatin protested that the real Revolution was in 1776, that the Federalist period should be regarded as an aberration, and that commemorating, even by implication, the overthrowing and execution of Washington might set a hideous precedent, as Gallatin insisted historians to still count Washington as the first president. In its final form, the Jefferson-Gallatin compromise utilizes 1776 as its "Year Zero".[page needed]

Year Zero is an album by the industrial rock group Nine Inch Nails, and is a concept album and Alternate Reality Game based on a post-apocalyptic earth.

Year Zero is a 2012 science fiction book by Rob Reid, in which aliens mark the beginning of a new era from the date they first hear human music.

"Year Zero" is the title of the 6th track from the Swedish metal band Ghost's second album, Infestissumam, about the ascendance of the Antichrist and a new era that represents a rejection of Christian-based time divisions such as BC ("Before Christ") and AD ("Anno Domini", or "year of our Lord").

^While it is increasingly common to place AD after a date by analogy to the use of BC, formal English usage adheres to the traditional practice of placing the abbreviation before the year as in Latin (e.g., 100 BC, but AD 100).

1.
0 A.D. (video game)
–
0 A. D. is a free, open-source, cross-platform real-time strategy game under development by Wildfire Games. It is a war and economy game focusing on the years between 500 B. C. and 1 B. C. for the first part. The game is cross-platform, playable on Windows, OS X, Linux, the game aims to be entirely free and open-source, using the GPL 2+ license for the game engine and CC BY-SA for the game art. 0 A. D. originally began as a total conversion mod concept for Age of Empires II. With limited design capabilities, the team turned to trying to create a full independent game based on their ideas. The game has been in development since 2000, with work starting in 2003. In November 2008, the developers confirmed that they would soon be releasing the project as open-source, on 10 July 2009, Wildfire Games released source code for 0 A. D. under the GPL 2+, and made the art content available under the CC BY-SA. There were about ten to fifteen people working on 0 A. D. around 23 March 2010, on 5 September 2013, an Indiegogo crowdfunding campaign was started with a US$160,000 goal. They raised a total of US$33,251 to be used to hire a programmer, the majority of the finances are managed by the Software in the Public Interest organisation. There is no release date set for the finished version. Pyrogenesis is the name of 0 A. D. s game engine and it was originally named Prometheus, after the Greek mythological character who stole fire from the gods, for the use of mankind. That name was changed in 2004, after another development team advertised the use of the name Prometheus for their own game, pyrogenesis is mostly written in C++ and uses Mozillas SpiderMonkey JavaScript engine for scripting. It also uses such open-source libraries as OpenGL, OpenAL, Boost, SDL, Vorbis and it supports open data formats such as COLLADA, XML and JSON. It is cross-platform, supporting Windows, OS X, Linux,0 A. D. features the real-time strategy gameplay components of building a base, training an army, combat, and technology research. The game is about economic development and warfare, the game will include multiple units and buildings specific to each civilization as well as both land and naval units. There are twelve different civilisations available, which are represented as they were at their top. During the game, the player will not advance through time, where the phases represent the sizes of settlements in history. Every phase unlocks new units, buildings and technologies, the game features both a singleplayer and a multiplayer mode

2.
Anno Domini
–
The terms anno Domini and before Christ are used to label or number years in the Julian and Gregorian calendars. The term anno Domini is Medieval Latin and means in the year of the Lord, There is no year zero in this scheme, so the year AD1 immediately follows the year 1 BC. This dating system was devised in 525 by Dionysius Exiguus of Scythia Minor, the Gregorian calendar is the most widely used calendar in the world today. Traditionally, English followed Latin usage by placing the AD abbreviation before the year number, however, BC is placed after the year number, which also preserves syntactic order. The abbreviation is widely used after the number of a century or millennium. Because BC is the English abbreviation for Before Christ, it is sometimes concluded that AD means After Death. However, this would mean that the approximate 33 years commonly associated with the life of Jesus would not be included in either of the BC, astronomical year numbering and ISO8601 avoid words or abbreviations related to Christianity, but use the same numbers for AD years. The Anno Domini dating system was devised in 525 by Dionysius Exiguus to enumerate the years in his Easter table. His system was to replace the Diocletian era that had used in an old Easter table because he did not wish to continue the memory of a tyrant who persecuted Christians. The last year of the old table, Diocletian 247, was followed by the first year of his table. Thus Dionysius implied that Jesus Incarnation occurred 525 years earlier, without stating the year during which his birth or conception occurred. Blackburn & Holford-Strevens briefly present arguments for 2 BC,1 BC, There were inaccuracies in the list of consuls There were confused summations of emperors regnal years It is not known how Dionysius established the year of Jesuss birth. It is convenient to initiate a calendar not from the day of an event. For example, the Islamic calendar begins not from the date of the Hegira, at the time, it was believed by some that the Resurrection and end of the world would occur 500 years after the birth of Jesus. The old Anno Mundi calendar theoretically commenced with the creation of the based on information in the Old Testament. It was believed that, based on the Anno Mundi calendar, Anno Mundi 6000 was thus equated with the resurrection and the end of the world but this date had already passed in the time of Dionysius. The Anglo-Saxon historian the Venerable Bede, who was familiar with the work of Dionysius Exiguus, used Anno Domini dating in his Ecclesiastical History of the English People, completed in 731. e. On the continent of Europe, Anno Domini was introduced as the era of choice of the Carolingian Renaissance by the English cleric and scholar Alcuin in the late eighth century

3.
Gregorian calendar
–
The Gregorian calendar is internationally the most widely used civil calendar. It is named after Pope Gregory XIII, who introduced it in October 1582, the calendar was a refinement to the Julian calendar involving a 0. 002% correction in the length of the year. The motivation for the reform was to stop the drift of the calendar with respect to the equinoxes and solstices—particularly the northern vernal equinox, transition to the Gregorian calendar would restore the holiday to the time of the year in which it was celebrated when introduced by the early Church. The reform was adopted initially by the Catholic countries of Europe, the last European country to adopt the reform was Greece, in 1923. Many countries that have used the Islamic and other religious calendars have come to adopt this calendar for civil purposes. The reform was a modification of a made by Aloysius Lilius. His proposal included reducing the number of years in four centuries from 100 to 97. Lilius also produced an original and practical scheme for adjusting the epacts of the moon when calculating the date of Easter. For example, the years 1700,1800, and 1900 are not leap years, but the years 1600 and 2000 are. The canonical Easter tables were devised at the end of the third century, when the vernal equinox fell either on 20 March or 21 March depending on the years position in the leap year cycle. As the rule was that the full moon preceding Easter was not to precede the equinox, the date was fixed at 21 March for computational purposes, the Gregorian calendar reproduced these conditions by removing ten days. To unambiguously specify a date, dual dating or Old Style, dual dating gives two consecutive years for a given date, because of differences in the starting date of the year, and/or to give both the Julian and the Gregorian dates. The Gregorian calendar continued to use the calendar era, which counts years from the traditional date of the nativity. This year-numbering system, also known as Dionysian era or Common Era, is the predominant international standard today, the Gregorian calendar is a solar calendar. A regular Gregorian year consists of 365 days, but as in the Julian calendar, in a leap year, in the Julian calendar a leap year occurs every 4 years, but the Gregorian calendar omits 3 leap days every 400 years. In the Julian calendar, this day was inserted by doubling 24 February. In the modern period, it has become customary to number the days from the beginning of the month, some churches, notably the Roman Catholic Church, delay February festivals after the 23rd by one day in leap years. Gregorian years are identified by consecutive year numbers, the cycles repeat completely every 146,097 days, which equals 400 years

4.
Julian calendar
–
The Julian calendar, proposed by Julius Caesar in 46 BC, was a reform of the Roman calendar. It took effect on 1 January 45 BC, by edict, the Julian calendar gains against the mean tropical year at the rate of one day in 128 years. For the Gregorian the figure is one day in 3,030 years, the difference in the average length of the year between Julian and Gregorian is 0. 002%. The Julian calendar has a year of 365 days divided into 12 months. A leap day is added to February every four years, the Julian year is, therefore, on average 365.25 days long. It was intended to approximate the tropical year, as a result, the calendar year gains about three days every four centuries compared to observed equinox times and the seasons. This discrepancy was corrected by the Gregorian reform of 1582, consequently, the Julian calendar is currently 13 days behind the Gregorian calendar. Egypt converted on 20 December 1874/1 January 1875, turkey switched on 16 February/1 March 1917. Russia changed on 1/14 February 1918, Greece made the change for civil purposes on 16 February/1 March 1923 - the national day, which was a religious holiday, was to remain on the old calendar. Most Christian denominations in the west and areas evangelised by western churches have replaced the Julian calendar with the Gregorian as the basis for their liturgical calendars. However, most branches of the Eastern Orthodox Church still use the Julian calendar for calculating the date of Easter, some Orthodox churches have adopted the Revised Julian calendar for the observance of fixed feasts, while other Orthodox churches retain the Julian calendar for all purposes. The Julian calendar is used by the Berbers of the Maghreb in the form of the Berber calendar. In the form of the Alexandrian calendar, it is the basis for the Ethiopian calendar, during the changeover between calendars and for some time afterwards, dual dating was used in documents and gave the date according to both systems. In contemporary as well as texts that describe events during the period of change. The ordinary year in the previous Roman calendar consisted of 12 months, in addition, a 27- or 28-day intercalary month, the Mensis Intercalaris, was sometimes inserted between February and March. The net effect was to add 22 or 23 days to the year, some say the mensis intercalaris always had 27 days and began on either the first or the second day after the Terminalia. According to the later writers Censorinus and Macrobius, the ideal intercalary cycle consisted of ordinary years of 355 days alternating with intercalary years, alternately 377 and 378 days long. In this system, the average Roman year would have had 366 1⁄4 days over four years, Macrobius describes a further refinement whereby, in one 8-year period within a 24-year cycle, there were only three intercalary years, each of 377 days

5.
Buddhist calendar
–
While the calendars share a common lineage, they also have minor but important variations such as intercalation schedules, month names and numbering, use of cycles, etc. In Thailand, the name Buddhist Era is a numbering system shared by the traditional Thai lunisolar calendar. The Southeast Asian lunisolar calendars are based on an older version of the Hindu calendar. One major difference is that the Southeast Asian systems, unlike their Indian cousins, instead, they employ their versions of the Metonic cycle. However, since the Metonic cycle is not very accurate for sidereal years, yet no coordinated structural reforms of the lunisolar calendar have been undertaken. Today, the traditional Buddhist lunisolar calendar is used mainly for Theravada Buddhist festivals, the Thai Buddhist Era, a renumbered Gregorian calendar, is the official calendar in Thailand. The Burmese calendar in turn was based on the original Surya Siddhanta system of ancient India, one key difference with Indian systems is that the Burmese system has followed a variation of the Metonic cycle. It is unclear from where, when or how the Metonic system was introduced, the Burmese system, and indeed the Southeast Asian systems, thus use a strange combination of sidereal years from Indian calendar in combination with the Metonic cycle better for tropical years. In all Theravada traditions, the epochal year 0 date was the day in which the Buddha attained parinibbāna. However, not all agree on when it actually took place. In Burmese Buddhist tradition, it was 13 May 544 BCE, but in Thailand, it was 11 March 545 BCE, the date which the current Thai lunisolar and solar calendars use as the epochal date. In Myanmar, the difference between BE and CE can be 543 or 544 for CE dates, and 544 or 543 for BCE dates, in Sri Lanka, the difference between BE and CE is 544. The calendar recognizes two types of months, synodic month and sidereal month, the Synodic months are used to compose the years while the 27 lunar sidereal days, alongside the 12 signs of the zodiac, are used for astrological calculations. The days of the month are counted in two halves, waxing and waning, the 15th of the waxing is the civil full moon day. The civil new moon day is the last day of the month, because of the inaccuracy of the calendrical calculation systems, the mean and real New Moons rarely coincide. The mean New Moon often precedes the real New Moon, as the Synodic lunar month is approximately 29.5 days, the calendar uses alternating months of 29 and 30 days. Various regional versions of Chula Sakarat/Burmese calendar existed across various regions of mainland Southeast Asia, unlike Cambodian and Burmese systems, Kengtung, Lan Na, Lan Xang and Sukhothai systems refer to the months by numbers, not by names. The Buddhist calendar is a calendar in which the months are based on lunar months

6.
Hindu calendar
–
Hindu calendar is a collective term for the various lunisolar calendars traditionally used in Hinduism. They adopt a similar underlying concept for timekeeping, but differ in their emphasis to moon cycle or the sun cycle, the names of months. A Hindu calendar is referred to as Panchanga. The ancient Hindu calendar is similar in design to the Jewish calendar. Early Buddhist communities of India adopted the ancient Indian calendar, later Vikrami calendar, Buddhist festivals continue to be scheduled according to a lunar system. The Buddhist calendar and the traditional calendars of Cambodia, Laos, Myanmar, Sri Lanka. Similarly, the ancient Jainism traditions have followed the lunisolar system as the Hindu calendar for festivals, texts. However, the Buddhist and Jaina timekeeping systems have attempted to use the Buddha, the Hindu calendar is also important to the practice of Hindu astrology and zodiac system, most of which it adopted from Greece, in centuries after the arrival of Alexander the Great. The Indian national calendar or Saka calendar was introduced in 1952 based on the traditional Hindu calendars and this study was one of the six ancient Vedangas, or ancillary science connected with the Vedas – the scriptures of Hinduism. The ancient Indian culture developed a time keeping methodology and calendars for Vedic rituals. David Pingree has proposed that the field of timekeeping in Jyotisha may have derived from Mesopotamia during the Achaemenid period. Ohashi states that this Vedanga field developed from actual astronomical studies in ancient India, timekeeping as well as the nature of solar and moon movements are mentioned in Vedic texts. For example, Kaushitaki Brahmana chapter 19.3 mentions the shift in the location of the sun towards north for 6 months. The Vikrami calendar is named after king Vikramaditya and starts in 57 BCE, Hindu scholars attempted to keep time by observing and calculating the cycles of sun, moon and the planets. These texts present Surya and various planets and estimate the characteristics of the respective planetary motion, other texts such as Surya Siddhanta dated to have been complete sometime between the 5th century and 10th century present their chapters on various planets with deity mythologies. The manuscripts of texts exist in slightly different versions, present Surya- and planets-based calculation. These vary in their data, suggesting that the text were open and they tracked the solar year by observing the entrance and departure of surya in the constellation formed by stars in the sky, which they divided into 12 intervals of 30 degrees each. Like other ancient human cultures, Hindus innovated a number of systems of which intercalary months became most used, as their calendar keeping and astronomical observations became more sophisticated, the Hindu calendar became more sophisticated with complex rules and greater accuracy

7.
Scythia Minor
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The earliest description of the region is found in Herodotus, who identified as Scythia the region starting north of the Danube delta. During later times, the area also witnessed Celtic and Scythian invasions and it was part of the kingdom of Dacia for a period, after which the region was conquered by the Roman Empire, becoming part of the province of Moesia Inferior. With Diocletians reforms, it was split from Moesia as a province of Scythia. After the partition of the Empire in 395, the province was retained by the Byzantine Empire and it maintained the name Scythia Minor, until the regions loss during the early 7th century to the migrating Slavs and Bulgars. After that, the name fell out of use. An ancient episcopal see of the late Roman province of Scythia Minor is included in the list of titular sees in the Annuario Pontificio, defensive strategies and cross border policies. Integration of the Lower Danube area in the Roman civilization Dicţionar de istorie veche a României Editura Ştiinţifică şi Enciclopedică, pp. 536–537

8.
Dionysius Exiguus
–
Dionysius Exiguus (Latin for Dionysius the Humble, c. AD544 was a 6th-century monk born in Scythia Minor. He was a member of a community of Scythian monks concentrated in Tomis, Dionysius is best known as the inventor of the Anno Domini era, which is used to number the years of both the Gregorian calendar and the Julian calendar. Some churches adopted his computus for the dates of Easter and these Collectiones canonum Dionysianae had great authority in the West, and continues to guide church administrations. Dionysius also wrote a treatise on elementary mathematics, according to his friend and fellow-student, Cassiodorus, Dionysius although by birth a Scythian, was in character a true Roman, most learned in both tongues. He was also a thorough catholic Christian and an accomplished Scripturist, by the 6th century, the term Scythian could mean an inhabitant of Scythia Minor, or simply someone from the north-east of the Greco-Roman world, centred on the Mediterranean. The term had a meaning, devoid of clear ethnic attributes. Furthermore, since none of the Scythian monks expressed any kinship, by blood or spiritual, with the Arian Goths who at that time ruled Italy, a Gothic origin for Dionysius is questionable. By the time of the flourishing of the Scythian monks, the provinces from the Lower Danube, most likely Dionysius was also of local Thraco-Roman origin, like Vitalians family to whom he was related, and the rest of the Scythian monks and other Thraco-Roman personalities of the era. Of great importance were the contributions of Dionysius to the tradition of canon law, a collection of synodal decrees, of which he has left two editions, a. This contains canons of Oriental synods and councils only in Greek and Latin, another bilingual version of Greek canons, undertaken at the instance of Pope Hormisdas, only the preface has been preserved. A collection of papal Constitutions from Siricius to Anastasius II, Dionysius is best known as the inventor of the Anno Domini era, which is used to number the years of both the Gregorian calendar and the Julian calendar. He used it to identify the several Easters in his Easter table, how he arrived at that number is unknown, but there is evidence of the system he applied. It has been suggested that he arranged the numbers so that leap years would be exactly divisible by four, and that his new table would begin one Victorian cycle, i. e.532 years, after his new epoch. The Anno Domini era became dominant in western Europe only after it was used by the Venerable Bede to date the events in his Ecclesiastical History of the English People, completed in 731. Evidence exists that Dionysius desire to replace Diocletian years with a based on the incarnation of Christ was to prevent people from believing the imminent end of the world. At the time, some believed that the Second Coming and end of the world would occur 500 years after the birth of Jesus, the current Anno Mundi calendar commenced with the creation of the world based on information in the Old Testament. It was believed that, based on the Anno Mundi calendar, Anno Mundi 6000 was thus equated with the second coming of Christ and the end of the world. In 525, Dionysius prepared a table of the dates of Easter

9.
Roman Emperor
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The Roman emperor was the ruler of the Roman Empire during the imperial period. The emperors used a variety of different titles throughout history, often when a given Roman is described as becoming emperor in English, it reflects his taking of the title Augustus or Caesar. Another title often used was imperator, originally a military honorific, early Emperors also used the title princeps. Emperors frequently amassed republican titles, notably Princeps Senatus, Consul, the first emperors reigned alone, later emperors would sometimes rule with co-Emperors and divide administration of the Empire between them. The Romans considered the office of emperor to be distinct from that of a king, the first emperor, Augustus, resolutely refused recognition as a monarch. Although Augustus could claim that his power was authentically republican, his successor, Tiberius, nonetheless, for the first three hundred years of Roman Emperors, from Augustus until Diocletian, a great effort was made to emphasize that the Emperors were the leaders of a Republic. Elements of the Republican institutional framework were preserved until the end of the Western Empire. The Eastern emperors ultimately adopted the title of Basileus, which had meant king in Greek, but became a title reserved solely for the Roman emperor, other kings were then referred to as rēgas. In addition to their office, some emperors were given divine status after death. The Western Roman Empire collapsed in the late 5th century, Romulus Augustulus is often considered to be the last emperor of the west after his forced abdication in 476, although Julius Nepos maintained a claim to the title until his death in 480. Constantine XI was the last Byzantine Roman emperor in Constantinople, dying in the Fall of Constantinople to the Ottomans in 1453, a Byzantine group of claimant Roman Emperors existed in the Empire of Trebizond until its conquest by the Ottomans in 1461. In western Europe the title of Roman Emperor was revived by Germanic rulers, the Holy Roman Emperors, in 800, at the end of the Roman Republic no new, and certainly no single, title indicated the individual who held supreme power. Insofar as emperor could be seen as the English translation of imperator, then Julius Caesar had been an emperor, however, Julius Caesar, unlike those after him, did so without the Senates vote and approval. Julius Caesar held the Republican offices of four times and dictator five times, was appointed dictator in perpetuity in 45 BC and had been pontifex maximus for a long period. He gained these positions by senatorial consent, by the time of his assassination, he was the most powerful man in the Roman world. In his will, Caesar appointed his adopted son Octavian as his heir, a decade after Caesars death, Octavians victory over his erstwhile ally Mark Antony at Actium put an end to any effective opposition and confirmed Octavians supremacy. His restoration of powers to the Senate and the people of Rome was a demonstration of his auctoritas, some later historians such as Tacitus would say that even at Augustus death, the true restoration of the Republic might have been possible. Instead, Augustus actively prepared his adopted son Tiberius to be his successor, the Senate disputed the issue but eventually confirmed Tiberius as princeps

10.
Diocletian
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Diocletian, born Diocles, was a Roman emperor from 284 to 305. Born to a family of low status in the Roman province of Dalmatia, after the deaths of Carus and his son Numerian on campaign in Persia, Diocletian was proclaimed emperor. The title was claimed by Carus other surviving son, Carinus. Diocletians reign stabilized the empire and marks the end of the Crisis of the Third Century and he appointed fellow officer Maximian as Augustus, co-emperor, in 286. Diocletian delegated further on 1 March 293, appointing Galerius and Constantius as Caesars, under this tetrarchy, or rule of four, each emperor would rule over a quarter-division of the empire. Diocletian secured the borders and purged it of all threats to his power. He defeated the Sarmatians and Carpi during several campaigns between 285 and 299, the Alamanni in 288, and usurpers in Egypt between 297 and 298, Galerius, aided by Diocletian, campaigned successfully against Sassanid Persia, the empires traditional enemy. In 299 he sacked their capital, Ctesiphon, Diocletian led the subsequent negotiations and achieved a lasting and favorable peace. He established new centres in Nicomedia, Mediolanum, Antioch. Building on third-century trends towards absolutism, he styled himself an autocrat, elevating himself above the masses with imposing forms of court ceremonies. Bureaucratic and military growth, constant campaigning, and construction increased the states expenditures. From at least 297 on, imperial taxation was standardized, made more equitable, not all of Diocletians plans were successful, the Edict on Maximum Prices, his attempt to curb inflation via price controls, was counterproductive and quickly ignored. Weakened by illness, Diocletian left the office on 1 May 305. He lived out his retirement in his palace on the Dalmatian coast and his palace eventually became the core of the modern-day city of Split in Croatia. Diocletian was born near Salona in Dalmatia, some time around 244 and his parents gave him the Greek name Diocles, or possibly Diocles Valerius. The modern historian Timothy Barnes takes his official birthday,22 December, other historians are not so certain. Diocles parents were of low status, and writers critical of him claimed that his father was a scribe or a freedman of the senator Anullinus, the first forty years of his life are mostly obscure. The Byzantine chronicler Joannes Zonaras states that he was Dux Moesiae, the often-unreliable Historia Augusta states that he served in Gaul, but this account is not corroborated by other sources and is ignored by modern historians of the period

11.
Diocletianic Persecution
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The Diocletianic or Great Persecution was the last and most severe persecution of Christians in the Roman Empire. Later edicts targeted the clergy and ordered all inhabitants to sacrifice to the Roman gods, the persecution varied in intensity across the empire—weakest in Gaul and Britain, where only the first edict was applied, and strongest in the Eastern provinces. Persecutory laws were nullified by different emperors at different times, but Constantine and it was not until the 250s, under the reigns of Decius and Valerian, that such laws were passed. Under this legislation, Christians were compelled to sacrifice to Roman gods or face imprisonment, when Gallienus acceded in 260, he issued the first imperial edict regarding tolerance toward Christians, leading to nearly 40 years of peaceful coexistence. Diocletians accession in 284 did not mark an immediate reversal of disregard to Christianity, in the first 15 years of his rule, Diocletian purged the army of Christians, condemned Manicheans to death, and surrounded himself with public opponents of Christianity. Diocletians preference for autocratic government, combined with his self-image as a restorer of past Roman glory, in the winter of 302, Galerius urged Diocletian to begin a general persecution of the Christians. Diocletian was wary, and asked the oracle of Apollo for guidance, the oracles reply was read as an endorsement of Galeriuss position, and a general persecution was called on February 24,303. Persecutory policies varied in intensity across the empire, where Galerius and Diocletian were avid persecutors, Constantius was unenthusiastic. Later persecutory edicts, including the calls for sacrifice, were not applied in his domain. His son, Constantine, on taking the office in 306, restored Christians to full legal equality. In Italy in 306, the usurper Maxentius ousted Maximians successor Severus, Galerius ended the persecution in the East in 311, but it was resumed in Egypt, Palestine, and Asia Minor by his successor, Maximinus. Constantine and Licinius, Severuss successor, signed the Edict of Milan in 313, Licinius ousted Maximinus in 313, bringing an end to persecution in the East. The persecution failed to check the rise of the church, by 324, Constantine was sole ruler of the empire, and Christianity had become his favored religion. Although the persecution resulted in death, torture, imprisonment, or dislocation for many Christians, the persecution did, however, cause many churches to split between those who had complied with imperial authority, and those who had remained pure. Certain schisms, like those of the Donatists in North Africa, the Donatists would not be reconciled to the Church until after 411. In the centuries that followed, some consider that Christians created a cult of the martyrs. These accounts were criticized during the Enlightenment and afterwards, most notably by Edward Gibbon, modern historians, such as G. E. M. de Ste. Croix, have attempted to determine whether Christian sources exaggerated the scope of the Diocletianic persecution, from its first appearance to its legalization under Constantine, for the first two centuries of its existence, Christianity and its practitioners were unpopular with the people at large

12.
Consulship
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A consul was the highest elected political office of the Roman Republic, and the consulship was considered the highest level of the cursus honorum. Each year, two consuls were elected together, to serve for a one-year term, the consuls alternated in holding imperium each month, and a consuls imperium extended over Rome, Italy, and the provinces. Originally, consuls were called praetors, referring to their duties as the military commanders. By at least 300 BC the title of Consul was being used, in Greek, the title was originally rendered as στρατηγός ὕπατος, strategos hypatos, and later simply as ὕπατος. The consul was believed by the Romans to date back to the establishment of the Republic in 509 BC. These remained in place until the office was abolished in 367/366 BC, consuls had extensive powers in peacetime, and in wartime often held the highest military command. Additional religious duties included certain rites which, as a sign of their formal importance, consuls also read auguries, an essential step before leading armies into the field. Two consuls were elected each year, serving together, each with power over the others actions. It is thought that only patricians were eligible for the consulship. Consuls were elected by the Comitia Centuriata, which had a bias in its voting structure which only increased over the years from its foundation. If a consul died during his term or was removed from office, a consul elected to start the year - called a consul ordinarius - held more prestige than a suffect consul, partly because the year would be named for ordinary consuls. The first plebeian consul, Lucius Sextius, was elected the following year and it is possible that only the chronology has been distorted, but it seems that one of the first consuls, Lucius Junius Brutus, came from a plebeian family. Another possible explanation is that during the 5th century social struggles, during times of war, the primary qualification for consul was military skill and reputation, but at all times the selection was politically charged. With the passage of time, the became the normal endpoint of the cursus honorum. When Lucius Cornelius Sulla regulated the cursus by law, the age of election to consul became. Beginning in the late Republic, after finishing a year, a former consul would usually serve a lucrative term as a proconsul. The most commonly chosen province for the proconsulship was Cisalpine Gaul, throughout the early years of the Principate although the consuls were still formally elected by the Comitia Centuriata, they were in fact nominated by the princeps. It was a post that would be occupied by a man halfway through his career, in his early thirties for a patrician, emperors frequently appointed themselves, or their protégés or relatives, consuls, even without regard to the age requirements

13.
Jesus Christ
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Jesus, also referred to as Jesus of Nazareth or Jesus Christ, was a Jewish preacher and religious leader who became the central figure of Christianity. Christians believe him to be the Son of God and the awaited Messiah prophesied in the Old Testament, Jesus was a Galilean Jew who was baptized by John the Baptist and subsequently began his own ministry, preaching his message orally and often being referred to as rabbi. He was arrested and tried by the Jewish authorities, and was crucified by the order of Pontius Pilate, Jesus debated fellow Jews on how to best follow God, performed healings, taught in parables and gathered followers. After his death, his followers believed he rose from the dead, and his birth is celebrated annually on December 25 as a holiday known as Christmas, his crucifixion is honored on Good Friday, and his resurrection is celebrated on Easter. The widely used calendar era AD, from the Latin anno Domini, most Christians believe Jesus enables humans to be reconciled to God. The Nicene Creed asserts that Jesus will judge the living and the dead either before or after their bodily resurrection, the great majority of Christians worship Jesus as the incarnation of God the Son, the second of three persons of a Divine Trinity. A minority of Christian denominations reject Trinitarianism, wholly or partly, in Islam, Jesus is considered one of Gods important prophets and the Messiah. Muslims believe Jesus was a bringer of scripture and was born of a virgin but was not the Son of God, the Quran states that Jesus himself never claimed divinity. To most Muslims, Jesus was not crucified but was raised into Heaven by God. Judaism rejects the belief that Jesus was the awaited Messiah, arguing that he did not fulfill Messianic prophecies, a typical Jew in Jesus time had only one name, sometimes supplemented with the fathers name or the individuals hometown. Thus, in the New Testament, Jesus is commonly referred to as Jesus of Nazareth, Jesus neighbors in Nazareth refer to him as the carpenter, the son of Mary and brother of James and Joses and Judas and Simon, the carpenters son, or Josephs son. In John, the disciple Philip refers to him as Jesus son of Joseph from Nazareth, the name Jesus is derived from the Latin Iesus, a transliteration of the Greek Ἰησοῦς. The Greek form is a rendering of the Hebrew ישוע‎, a variant of the earlier name יהושע‎, the name Yeshua appears to have been in use in Judea at the time of the birth of Jesus. The 1st century works of historian Flavius Josephus, who wrote in Koine Greek, the etymology of Jesus name in the context of the New Testament is generally given as Yahweh is salvation. Since early Christianity, Christians have commonly referred to Jesus as Jesus Christ, the word Christ is derived from the Greek Χριστός, which is a translation of the Hebrew משיח, meaning the anointed and usually transliterated into English as Messiah. Christians designate Jesus as Christ because they believe he is the Messiah, whose arrival is prophesied in the Hebrew Bible, in postbiblical usage, Christ became viewed as a name—one part of Jesus Christ—but originally it was a title. The term Christian has been in use since the 1st century, the four canonical gospels are the only substantial sources for the life and message of Jesus. Acts of the Apostles refers to the ministry of Jesus

14.
Bede
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He is well known as an author and scholar, and his most famous work, Ecclesiastical History of the English People gained him the title The Father of English History. Bedes monastery had access to a library which included works by Eusebius, Orosius. Almost everything that is known of Bedes life is contained in the last chapter of his Ecclesiastical History of the English People, a history of the church in England. It was completed in about 731, and Bede implies that he was then in his fifty-ninth year, a minor source of information is the letter by his disciple Cuthbert which relates Bedes death. Bede, in the Historia, gives his birthplace as on the lands of this monastery, Bede says nothing of his origins, but his connections with men of noble ancestry suggest that his own family was well-to-do. Bedes first abbot was Benedict Biscop, and the names Biscop, Bedes name reflects West Saxon Bīeda. It is an Anglo-Saxon short name formed on the root of bēodan to bid, the name also occurs in the Anglo-Saxon Chronicle, s. a. 501, as Bieda, one of the sons of the Saxon founder of Portsmouth, the Liber Vitae of Durham Cathedral names two priests with this name, one of whom is presumably Bede himself. Some manuscripts of the Life of Cuthbert, one of Bedes works, mention that Cuthberts own priest was named Bede, at the age of seven, Bede was sent to the monastery of Monkwearmouth by his family to be educated by Benedict Biscop and later by Ceolfrith. Bede does not say whether it was intended at that point that he would be a monk. Monkwearmouths sister monastery at Jarrow was founded by Ceolfrith in 682, in 686, plague broke out at Jarrow. The two managed to do the service of the liturgy until others could be trained. The young boy was almost certainly Bede, who would have been about 14, when Bede was about 17 years old, Adomnán, the abbot of Iona Abbey, visited Monkwearmouth and Jarrow. Bede would probably have met the abbot during this visit, in about 692, in Bedes nineteenth year, Bede was ordained a deacon by his diocesan bishop, John, who was bishop of Hexham. There might have been minor orders ranking below a deacon, in Bedes thirtieth year, he became a priest, with the ordination again performed by Bishop John. In about 701 Bede wrote his first works, the De Arte Metrica and De Schematibus et Tropis and he continued to write for the rest of his life, eventually completing over 60 books, most of which have survived. Not all his output can be dated, and Bede may have worked on some texts over a period of many years. His last-surviving work is a letter to Ecgbert of York, a former student, Bede may also have worked on one of the Latin bibles that were copied at Jarrow, one of which is now held by the Laurentian Library in Florence

15.
Historia ecclesiastica gentis Anglorum
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It is believed to have been completed in 731 when Bede was approximately 59 years old. The Historia ecclesiastica gentis Anglorum, or An Ecclesiastical History of the English People is Bedes best-known work, the first of the five books begins with some geographical background and then sketches the history of England, beginning with Caesars invasion in 55 BC. The second book begins with the death of Gregory the Great in 604, and follows the progress of Christianity in Kent. These encountered a setback when Penda, the king of Mercia. The setback was temporary, and the book recounts the growth of Christianity in Northumbria under kings Oswald. The climax of the book is the account of the Council of Whitby. The fourth book begins with the consecration of Theodore as Archbishop of Canterbury, the fifth book brings the story up to Bedes day, and includes an account of missionary work in Frisia, and of the conflict with the British church over the correct dating of Easter. Bede wrote a preface for the work, in which he dedicates it to Ceolwulf, the preface mentions that Ceolwulf received an earlier draft of the book, presumably Ceolwulf knew enough Latin to understand it, and he may even have been able to read it. Divided into five books, the Historia covers the history of England, ecclesiastical and political and this is impressive, nevertheless, the Historia, like other historical writing from this period has a lower degree of objectivity than modern historical writings. It seems to be a mixture of fact, legend and literature, the monastery at Jarrow had an excellent library. Both Benedict Biscop and Ceolfrith had acquired books from the Continent, for the period prior to Augustines arrival in 597, Bede drew on earlier writers, including Orosius, Eutropius, Pliny, and Solinus. He used Constantiuss Life of Germanus as a source for Germanuss visits to Britain, Bedes account of the invasion of the Anglo-Saxons is drawn largely from Gildass De Excidio et Conquestu Britanniae. Bede would also have been familiar with more recent accounts such as Eddius Stephanuss Life of Wilfrid and he also drew on Josephuss Antiquities, and the works of Cassiodorus, and there was a copy of the Liber Pontificalis in Bedes monastery. Bede also had correspondents who supplied him with material, almost all of Bedes information regarding Augustine is taken from these letters, which includes the Libellus responsionum, as chapter 27 of book 1 is often known. Bede also mentions an Abbot Esi as a source for the affairs of the East Anglian church, the historian Walter Goffart argues that Bede based the structure of the Historia on three works, using them as the framework around which the three main sections of the work were structured. For the early part of the work, up until the Gregorian mission, the second section, detailing the Gregorian mission of Augustine of Canterbury was framed on the anonymous Life of Gregory the Great written at Whitby. The last section, detailing events after the Gregorian mission, Goffart asserts were modelled on Stephen of Ripons Life of Wilfrid, the History of the English Church and People has a clear polemical and didactic purpose. Bede sets out not just to tell the story of the English, in political terms he is a partisan of his native Northumbria, amplifying its role in English history over and above that of Mercia, its great southern rival

16.
Roman calendar
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The Roman calendar is the calendar used by the Roman kingdom and republic. The original calendar consisted of 10 months beginning in spring with March and these months ran for 38 nundinal cycles, each forming a kind of eight day week ended by religious rituals and a public market. The winter period was used to create January and February. The legendary early kings Romulus and Numa were traditionally credited with establishing this early fixed calendar, in particular, the kalends, nones, and ides seem to have derived from the first sighting of the crescent moon, the first-quarter moon, and the full moon respectively. The system ran well short of the year, and it needed constant intercalation to keep religious festivals. For superstitious reasons, such intercalation occurred within the month of February even after it was no longer considered the last month. Having won his war with Pompey, Caesar used his position as Romes chief pontiff to enact a calendar reform in 46 BC, in order to bring the calendar back to its proper place, Augustus was obliged to suspend intercalation for a few decades. The original Roman calendar is believed to have been a lunar calendar whose months began from the first signs of a new crescent moon. Because a lunar cycle is about 29½ days long, such months would have varied between 29 and 30 days, Romes 8-day week, the nundinal cycle, was shared with the Etruscans, who used it as the schedule of royal audiences. It was presumably a feature of the calendar and was credited in Roman legend variously to Romulus and Servius Tullius. The Romans themselves described their first organized year as one with ten fixed months, such a decimal division fit general Roman practice. The four 31-day months were called full and the others hollow and its 304 days made up exactly 38 nundinal cycles. Later Roman writers credited this calendar to Romulus, their legendary first king and culture hero, although this was common with other practices and traditions whose origin had been lost to them. Rüpke also finds the coincidence of the length of the supposed Romulan year with the length of the first ten months of the Julian calendar to be suspicious, other traditions existed alongside this one, however. Plutarchs Parallel Lives recounts that Romuluss calendar had been solar but adhered to the principle that the year should last for 360 days. Months were employed secondarily and haphazardly, with some counted as 20 days, the attested calendar of the Roman Republic was quite different. It followed Greek calendars in assuming a lunar cycle of 29½ days and a year of 12½ synodic months. The additional two months of the year were January and February, the month was sometimes known as Mercedonius

17.
Week
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A week is a time unit equal to seven days. It is the time period used for cycles of rest days in most parts of the world. The days of the week were named after the planets in the Roman era. In English, the names are Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday. ISO8601 includes the ISO week date system, a system for weeks within a given year – each week begins on a Monday and is associated with the year that contains that weeks Thursday. ISO8601 assigns numbers to the days of the week, running from 1 to 7 for Monday through to Sunday, the English word week comes from the Old English wice, ultimately from a Common Germanic *wikōn-, from a root *wik- turn, move, change. The Germanic word probably had a wider meaning prior to the adoption of the Roman calendar, perhaps succession series, the seven-day week is named in many languages by a word derived from seven. The archaism sennight preserves the old Germanic practice of reckoning time by nights, hebdomad and hebdomadal week both derive from the Greek hebdomás. The obsolete septimane is cognate with the Romance terms derived from Latin septimana, Slavic has a formation *tъdьnь, from *tъ this + *dьnь day, in some cases alongside nedělja, a loan-translation of Latin feria and sedmitsa, as ἑβδομάς derived from seven. Chinese has 星期, as it were planetary time unit, there are exactly 20,871 weeks in 400 Gregorian years, so 5 April 1617 was a Wednesday just like 5 April 2017. Relative to the path of the Moon, a week is 23. 659% of an average lunation, historically, the system of Dominical letters has been used to facilitate calculation of the day of week. The day of the week can be calculated given a dates Julian day number. The days of the week were named for the classical planets. This naming system persisted alongside an ecclesiastical tradition of numbering the days, the ordering of the weekday names are not that of the classical order of the planets. Instead, the planetary hours systems resulted in succeeding days being named for planets that are three places apart in their traditional listing and this characteristic was apparently discussed in Plutarch in a treatise written in c. AD100, which is reported to have addressed the question of Why are the named after the planets reckoned in a different order from the actual order. An ecclesiastical, non-astrological, system of numbering the days of the week was adopted in Late Antiquity and this model also seems to have influenced the designation of Wednesday as mid-week in Old High German and Old Church Slavonic. Old Church Slavonic may have modeled the name of Monday, понєдѣльникъ

18.
Ecclesiastical Latin
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Ecclesiastical Latin is the form of the Latin language used in the Roman Rite of the Latin Church of the Catholic Church for liturgical and other purposes. It is distinguished from Classical Latin by some variations, a simplified syntax. Ecclesiastical Latin is the language of the Holy See and the only surviving sociolect of spoken Latin. During the Late Republic and Early Empire periods, educated Roman citizens were generally fluent in Greek, the Holy See has no obligation to use Latin as its official language and, in theory, could change its practice. As Latin is no longer in use, the meaning of words is less likely to change radically from century to century. Since Latin is spoken as a language by no modern community. Especially since the Second Vatican Council of 1962–1965, the Church no longer uses Latin as the language of the Roman and Ambrosian liturgies of the Latin rites of the Catholic Church. As early as 1913, the Catholic Encyclopedia commented that Latin was starting to be replaced by vernacular languages, however, the Church still produces its official liturgical texts in Latin, which provide a single clear point of reference for translations into all other languages. For example, the writers of the Catechism of the Catholic Church drafted it in French, but five years later, when the Latin text appeared in 1997, the French text underwent correction to stay in line with the Latin version. The Latin language department of the Vatican Secretariat of State is charged with the preparation in Latin of papal and curial documents. Occasionally, the texts are published in a modern language, including such well-known texts as the motu proprio Tra le sollecitudini by Pope Pius X. The written Latin of today, as used for Church purposes, does not differ radically from classical Latin, Study of the language of Cicero and Virgil suffices adequately for understanding Church Latin. AE and OE coalesce with E, and before these letters and the letter I, TI followed by a vowel is generally pronounced /tsi/. Such speakers pronounce consonantal V as in English, and double consonants are pronounced as such, the distinction in Classical Latin between long and short vowels is abandoned, and instead of the macron, a horizontal line marking the long vowel, an acute accent is used for stress. The first syllable of words is stressed, in longer words. Ecclesiastics in some countries follow different traditions. The complete text of the Bible in Latin appears at Nova Vulgata - Bibliorum Sacrorum Editio, another site gives the entire Bible, in the Douay version, verse by verse, accompanied by the Vulgate Latin of each verse. In 1976 the Latinitas Foundation was established by Pope Paul VI to promote the study and its headquarters are in Vatican City

19.
Anno mundi
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Anno Mundi, abbreviated as AM or A. M. or Year After Creation, is a calendar era based on the biblical accounts of the creation of the world and subsequent history. That calendar is similar to the Julian calendar except that its epoch is equivalent to 1 September 5509 BC on the Julian proleptic calendar, the Hebrew calendar is based on rabbinic calculations of the year of creation from the Hebrew Masoretic text of the bible. This calendar is used within Jewish communities for religious and other purposes, on the Hebrew calendar, the day begins at sunset. The calendars epoch, corresponding to the date of the worlds creation, is equivalent to sunset on the Julian proleptic calendar date 6 October 3761 BC. The new year begins at Rosh Hashanah, roughly in September, Year anno mundi 5777, or AM5777, began at sunset on 2 October 2016 on the Gregorian calendar. While differences in biblical interpretation or in calculation methodology can produce differences in the creation date. The primary reason for the disparity seems to lie in which underlying Biblical text is chosen, most of the 1, 732-year difference resides in numerical discrepancies in the genealogies of the two versions of the Book of Genesis. The net difference between the two genealogies of Genesis is 1466 years, 85% of the total difference. During the Talmudic era, from the 1st to the 10th centuries AD, jews in these regions used Seleucid Era dating as the primary method for calculating the calendar year. Why not say that it is reckoned from the Exodus from Egypt, omitting the first thousand years, in that case, the document is really post-dated. Said Rav Nahman, In the Diaspora the Greek Era alone is used and he thought that Rav Nahman wanted to dispose of him anyhow, but when he went and studied it thoroughly he found that it is indeed taught, In the Diaspora the Greek Era alone is used. By his calculation, based on the Masoretic Text, Adam and Eve were created on 1st of Tishrei in 3760 BC, in the 8th and 9th centuries AD, the center of Jewish life moved from Babylonia to Europe, so calculations from the Seleucid era became meaningless. From the 11th century, anno mundi dating became dominant throughout most of the worlds Jewish communities, the new system reached its definitive form in AD1178 when Maimonides completed the Mishneh Torah. In the section Sanctification of the Moon, he wrote of his choice of Epoch, from which calculations of all dates should be made, which is the year 4938 of the creation of the world. He included all the rules for the calculated calendar epoch and their basis, including the modern epochal year in his work. The first year of the Jewish calendar, Anno Mundi 1, began one year before Creation. The first five days of Jewish Creation week occupy the last five days of AM1, the sixth day of Creation, when Adam and Eve were created, is the first day of AM2, Rosh Hashanah. Its associated molad Adam occurred on Day 5 at 14 hours and this is also called molad BaHaRaD, because it occurred on Day 2,5 hours,204 parts

20.
Creation myth
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A creation myth is a symbolic narrative of how the world began and how people first came to inhabit it. While in popular usage the term often refers to false or fanciful stories, formally. Cultures generally regard their creation myths as true, in the society in which it is told, a creation myth is usually regarded as conveying profound truths, metaphorically, symbolically and sometimes in a historical or literal sense. They are commonly, although not always, considered cosmogonical myths – that is, Creation myths often share a number of features. They often are considered sacred accounts and can be found in all known religious traditions. They are all stories with a plot and characters who are either deities, human-like figures, or animals and they are often set in a dim and nonspecific past that historian of religion Mircea Eliade termed in illo tempore. Creation myths develop in oral traditions and therefore typically have multiple versions, found throughout human culture, Creation myth definitions from modern references, A symbolic narrative of the beginning of the world as understood in a particular tradition and community. Creation myths are of importance for the valuation of the world, for the orientation of humans in the universe. Creation myths tell us how things began, all cultures have creation myths, they are our primary myths, the first stage in what might be called the psychic life of the species. As cultures, we identify ourselves through the collective dreams we call creation myths, … Creation myths explain in metaphorical terms our sense of who we are in the context of the world, and in so doing they reveal our real priorities, as well as our real prejudices. Our images of creation say a deal about who we are. A philosophical and theological elaboration of the myth of creation within a religious community. Religion professor Mircea Eliade defined the word myth in terms of creation, Myth narrates a history, it relates an event that took place in primordial Time. All creation myths are in one sense etiological because they attempt to explain how the world was formed, in the past historians of religion and other students of myth thought of them as forms of primitive or early-stage science or religion and analyzed them in a literal or logical sense. However they are seen as symbolic narratives which must be understood in terms of their own cultural context. Charles Long writes, The beings referred to in the myth – gods, animals, the myths should not be understood as attempts to work out a rational explanation of deity. While creation myths are not literal explications they do serve to define an orientation of humanity in the world in terms of a birth story. They are the basis of a worldview that reaffirms and guides how people relate to the world, to any assumed spiritual world

21.
Adam (Bible)
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Adam is a figure from the Book of Genesis who is also mentioned in the New Testament, the deuterocanonical books, the Quran, the Book of Mormon, and the Book of Iqan. According to the myth of the Abrahamic religions, he was the first human. In the Genesis creation narratives, he was created by God, Christian churches differ on how they view Adams subsequent behavior of disobeying God, and to the consequences that those actions had on the rest of humanity. Christian and Jewish teachings sometimes hold Adam and Eve to a different level of responsibility for the Fall, in addition, Islam holds that Adam was eventually forgiven, while Christianity holds that redemption occurred only later through the sacrifice of Jesus. The Baháí Faith, Islam and some Christian denominations consider Adam to be the first prophet, Adam as a proper name, predates its generic use in Semitic languages. Its earliest known use as a name in historicity is Adamu. Its use as a word in the Hebrew language is ׳āḏām. Coupled with the article, it becomes the human. Its root is not attributed to the Semitic root for man --sh, rather, ׳āḏām is linked to its triliteral root אָדָם‎, meaning red, fair, handsome. As a masculine noun, adam means man, mankind usually in a context as in humankind. The noun adam is also the form of the word adamah which means ground or earth. It is related to the words, adom, admoni, according to a number of observers, the word Adam derives from Sanskrit word Adima, meaning progenitor, first, primitive in Sanskrit. In the Book of Genesis, the Hebrew word ׳āḏām is often rendered mankind in the most generic sense, the use of mankind in Genesis, gives the reflection that Adam was the ancestor of all men. Kabbalistic works indicate that Adam also comes from the Hebrew word Adame, in the first five chapters of Genesis the word אָדָם is used in all of its senses, collectively, individually, gender nonspecific, and male. According to the Jewish Encyclopedia, its use in Genesis 1 is generic, while in Genesis 2 and Genesis 3 the generic and personal usages are mixed. In Genesis 1,27 adam is used in the sense, whereby not only the individual Adam. Genesis 2,7 is the first verse where Adam takes on the sense of an individual man, the gender distinction of adam is then reiterated in Genesis 5, 1–2 by defining male and female. A recurring literary motif that occurs, is the bond between Adam and the earth, Gods cursing of Adam also results in the ground being cursed, causing him to have to labour for food, and Adam returns to the earth from which he was taken

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Genesis creation narrative
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The Genesis creation narrative is the creation myth of both Judaism and Christianity. Two creation stories are found in the first two chapters of the Book of Genesis. In the second story, God, now referred to by the personal name Yahweh, creates Adam, the first man, from dust and places him in the Garden of Eden, eve, the first woman, is created from Adam and as his companion. The two sources can be identified in the narrative, Genesis 1, 1–2,3 is Priestly and Genesis 2. The combined narrative is a critique of the Mesopotamian theology of creation, Genesis affirms monotheism, robert Alter described the combined narrative as compelling in its archetypal character, its adaptation of myth to monotheistic ends. Misunderstanding the genre of the Genesis creation narrative, meaning the intention of the author/s, reformed evangelical scholar Bruce Waltke cautions against one such misreading, the approach which reads it as history rather than theology and so leads to Creationism and the denial of evolution. As noted scholar of Jewish studies, Jon D. Levenson, puts it, although tradition attributes Genesis to Moses, biblical scholars hold that it, together with the following four books, is a composite work, the product of many hands and periods. The two sources appear in chronological order, Genesis 1, 1–2,3 is Priestly. As for the background which led to the creation of the narrative itself. The creation narrative is made up of two stories, roughly equivalent to the two first chapters of the Book of Genesis. The first account employs a structure of divine fiat and fulfillment, then the statement And there was evening and there was morning. In each of the first three days there is an act of division, day one divides the darkness from light, day two the waters above from the waters below, and day three the sea from the land. Together, this combination of character and contrasting profile point to the different origin of materials in Genesis 1,1 and Genesis 2,4. The primary accounts in each chapter are joined by a bridge at Genesis 2,4, These are the generations of the heavens. This echoes the first line of Genesis 1, In the beginning God created the heaven and the earth, and is reversed in the next phrase. in the day that the LORD God made the earth and the heavens. This verse is one of ten generations phrases used throughout Genesis and they normally function as headings to what comes after, but the position of this, the first of the series, has been the subject of much debate. Comparative mythology provides historical and cross-cultural perspectives for Jewish mythology, Genesis 1–11 as a whole is imbued with Mesopotamian myths. Genesis 1 bears both striking differences from and striking similarities to Babylons national creation myth, the Enuma Elish, still, Genesis 1 bears similarities to the Baal Cycle of Israels neighbor, Ugarit

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Abraham
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Abraham, originally Abram, is the first of the three patriarchs of Judaism. His story features in the texts of all the Abrahamic religions and Abraham plays a prominent role as an example of faith in Judaism, Christianity. The biblical narrative revolves around the themes of posterity and land, Abraham is called by God to leave the house of his father Terah and settle in the land originally given to Canaan, but which God now promises to Abraham and his progeny. Various candidates are put forward who might inherit the land after Abraham, Abraham later marries Keturah and has six more sons, but on his death, when he is buried beside Sarah, it is Isaac who receives all Abrahams goods, while the other sons receive only gifts. Terah, the ninth in descent from Noah, was the father of three sons, Abram, Nahor, and Haran, Haran was the father of Lot, and died in his native city, Ur of the Chaldees. Abram married Sarah, who was barren, Terah, with Abram, Sarai, and Lot, then departed for Canaan, but settled in a place named Haran, where Terah died at the age of 205. Abram was 75 years old when he left Haran with his wife Sarai, his nephew Lot, and the substance and souls that they had acquired, and traveled to Shechem in Canaan. There was a famine in the land of Canaan, so that Abram and Lot and their households. On the way Abram told his wife Sarai to say that she was his sister, however, God afflicted Pharaoh and his household with great plagues, for which he tried to find the reason. Upon discovering that Sarai was a woman, Pharaoh demanded that they and their household leave immediately. When they came back to the Bethel and Hai area, Abrams and this became a problem for the herdsmen who were assigned to each familys cattle. But Lot chose to go east to the plain of Jordan where the land was well watered everywhere as far as Zoar, Abram went south to Hebron and settled in the plain of Mamre, where he built another altar to worship God. During the rebellion of the Jordan River cities against Elam, Abrams nephew, the Elamite army came to collect the spoils of war, after having just defeated the king of Sodoms armies. Lot and his family, at the time, were settled on the outskirts of the Kingdom of Sodom which made them a visible target, one person who escaped capture came and told Abram what happened. Once Abram received this news, he immediately assembled 318 trained servants, Abrams force headed north in pursuit of the Elamite army, who were already worn down from the Battle of Siddim. When they caught up with them at Dan, Abram devised a plan by splitting his group into more than one unit. Not only were able to free the captives, Abrams unit chased and slaughtered the Elamite King Chedorlaomer at Hobah. They freed Lot, as well as his household and possessions, upon Abrams return, Sodoms king came out to meet with him in the Valley of Shaveh, the kings dale

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Septuagint
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The Septuagint is a Koine Greek translation of an Hebraic textual tradition that included certain texts which were later included in the canonical Hebrew Bible and other related texts which were not. As the primary Greek translation of the Old Testament, it is called the Greek Old Testament. This translation is quoted a number of times in the New Testament, particularly in Pauline epistles, the title and its Roman numeral LXX refer to the legendary seventy Jewish scholars who solely translated the Five Books of Moses into Koine Greek as early as the 3rd century BCE. Separated from the Hebrew canon of the Jewish Bible in Rabbinic Judaism, the traditional story is that Ptolemy II sponsored the translation of the Torah. The Septuagint should not be confused with the seven or more other Greek versions of the Old Testament, of these, the most important are those by Aquila, Symmachus, and Theodotion. However, it was not until the time of Augustine of Hippo that the Greek translation of the Jewish scriptures came to be called by the Latin term Septuaginta. This narrative is found in the pseudepigraphic Letter of Aristeas to his brother Philocrates, the story is also found in the Tractate Megillah of the Babylonian Talmud, King Ptolemy once gathered 72 Elders. He placed them in 72 chambers, each of them in a separate one and he entered each ones room and said, Write for me the Torah of Moshe, your teacher. God put it in the heart of one to translate identically as all the others did. Philo of Alexandria, who relied extensively on the Septuagint, says that the number of scholars was chosen by selecting six scholars from each of the tribes of Israel. After the Torah, other books were translated over the two to three centuries. It is not altogether clear which was translated when, or where, some may even have been translated twice, into different versions, the quality and style of the different translators also varied considerably from book to book, from the literal to paraphrasing to interpretative. The translation of the Septuagint itself began in the 3rd century BCE and was completed by 132 BCE, initially in Alexandria, the Septuagint is the basis for the Old Latin, Slavonic, Syriac, Old Armenian, Old Georgian and Coptic versions of the Christian Old Testament. Some sections of the Septuagint may show Semiticisms, or idioms and phrases based on Semitic languages like Hebrew, other books, such as Daniel and Proverbs, show Greek influence more strongly. The Septuagint may also elucidate pronunciation of pre-Masoretic Hebrew, many nouns are spelled out with Greek vowels in the LXX. However, it is unlikely that all ancient Hebrew sounds had precise Greek equivalents. As the work of translation progressed, the canon of the Greek Bible expanded, the Torah always maintained its pre-eminence as the basis of the canon, but the collection of prophetic writings, based on the Jewish Neviim, had various hagiographical works incorporated into it. In addition, some books were included in the Septuagint

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Eusebius of Caesarea
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Eusebius of Caesarea, also known as Eusebius Pamphili, was a Greek historian of Christianity, exegete, and Christian polemicist. He became the bishop of Caesarea Maritima about 314 AD, together with Pamphilus, he was a scholar of the Biblical canon and is regarded as an extremely well learned Christian of his time. He wrote Demonstrations of the Gospel, Preparations for the Gospel, as Father of Church History he produced the Ecclesiastical History, On the Life of Pamphilus, the Chronicle and On the Martyrs. Little is known about the life of Eusebius and his successor at the See of Caesarea, Acacius, wrote a Life of Eusebius, a work that has since been lost. Eusebius own surviving works probably only represent a portion of his total output. Beyond notices in his extant writings, the sources are the 5th-century ecclesiastical historians Socrates, Sozomen, and Theodoret. There are assorted notices of his activities in the writings of his contemporaries Athanasius, Arius, Eusebius of Nicomedia, Eusebius pupil, Eusebius of Emesa, provides some incidental information. In his Ecclesiastical History, Eusebius writes of Dionysius of Alexandria as his contemporary, if this is true, Eusebius birth must have been before Dionysius death in autumn 264, most modern scholars date the birth to some point in the five years between 260 and 265. He was presumably born in the town in which he lived for most of his adult life and he was baptized and instructed in the city, and lived in Palestine in 296, when Diocletians army passed through the region. Eusebius was made presbyter by Agapius of Caesarea, S. Wallace-Hadrill, deem the phrase too ambiguous to support the contention. By the 3rd century, Caesarea had a population of about 100,000 and it had been a pagan city since Pompey had given control of the city to the gentiles during his command of the eastern provinces in the 60s BC. The gentiles retained control of the city for the three centuries to follow, despite Jewish petitions for joint governorship, gentile government was strengthened by the citys refoundation under Herod the Great, when it had taken on the name of Augustus Caesar. In addition to the settlers, Caesarea had large Jewish. Eusebius was probably born into the Christian contingent of the city.46 states that Zacchaeus was the first bishop, through the activities of the theologian Origen and the school of his follower Pamphilus, Caesarea became a center of Christian learning. Origen was largely responsible for the collection of information, or which churches were using which gospels. On his deathbed, Origen had made a bequest of his library to the Christian community in the city. Together with the books of his patron Ambrosius, Origens library formed the core of the collection that Pamphilus established, Pamphilus also managed a school that was similar to that of Origen. Pamphilus was compared to Demetrius of Phalerum and Pisistratus, for he had gathered Bibles from all parts of the world, like his model Origen, Pamphilus maintained close contact with his students

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Julius Caesar
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Gaius Julius Caesar, known as Julius Caesar, was a Roman politician, general, and notable author of Latin prose. He played a role in the events that led to the demise of the Roman Republic. In 60 BC, Caesar, Crassus, and Pompey formed an alliance that dominated Roman politics for several years. Their attempts to power as Populares were opposed by the Optimates within the Roman Senate. Caesars victories in the Gallic Wars, completed by 51 BC, extended Romes territory to the English Channel, Caesar became the first Roman general to cross both the Channel and the Rhine, when he built a bridge across the Rhine and crossed the Channel to invade Britain. These achievements granted him unmatched military power and threatened to eclipse the standing of Pompey, with the Gallic Wars concluded, the Senate ordered Caesar to step down from his military command and return to Rome. Caesar refused the order, and instead marked his defiance in 49 BC by crossing the Rubicon with the 13th Legion, leaving his province, Civil war resulted, and Caesars victory in the war put him in an unrivalled position of power and influence. After assuming control of government, Caesar began a programme of social and governmental reforms and he centralised the bureaucracy of the Republic and was eventually proclaimed dictator in perpetuity, giving him additional authority. But the underlying political conflicts had not been resolved, and on the Ides of March 44 BC, a new series of civil wars broke out, and the constitutional government of the Republic was never fully restored. Caesars adopted heir Octavian, later known as Augustus, rose to power after defeating his opponents in the civil war. Octavian set about solidifying his power, and the era of the Roman Empire began, much of Caesars life is known from his own accounts of his military campaigns, and from other contemporary sources, mainly the letters and speeches of Cicero and the historical writings of Sallust. The later biographies of Caesar by Suetonius and Plutarch are also major sources, Caesar is considered by many historians to be one of the greatest military commanders in history. Caesar was born into a family, the gens Julia. The cognomen Caesar originated, according to Pliny the Elder, with an ancestor who was born by Caesarean section. The Historia Augusta suggests three alternative explanations, that the first Caesar had a head of hair, that he had bright grey eyes. Caesar issued coins featuring images of elephants, suggesting that he favored this interpretation of his name, despite their ancient pedigree, the Julii Caesares were not especially politically influential, although they had enjoyed some revival of their political fortunes in the early 1st century BC. Caesars father, also called Gaius Julius Caesar, governed the province of Asia and his mother, Aurelia Cotta, came from an influential family. Little is recorded of Caesars childhood, in 85 BC, Caesars father died suddenly, so Caesar was the head of the family at 16

27.
Claudius
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Claudius was Roman emperor from 41 to 54. A member of the Julio-Claudian dynasty, he was the son of Drusus and he was born at Lugdunum in Gaul, the first Roman Emperor to be born outside Italy. Claudius infirmity probably saved him from the fate of other nobles during the purges of Tiberius and Caligulas reigns. His survival led to his being declared Emperor by the Praetorian Guard after Caligulas assassination, despite his lack of experience, Claudius proved to be an able and efficient administrator. He was also a builder, constructing many new roads, aqueducts. During his reign the Empire began the conquest of Britain, having a personal interest in law, he presided at public trials, and issued up to twenty edicts a day. He was seen as vulnerable throughout his reign, particularly by elements of the nobility, Claudius was constantly forced to shore up his position, this resulted in the deaths of many senators. These events damaged his reputation among the ancient writers, though more recent historians have revised this opinion, many authors contend that he was murdered by his own wife. After his death in 54 AD, his grand-nephew and adopted son Nero succeeded him as Emperor, Claudius was born on 1 August 10 BC at Lugdunum. He had two siblings, Germanicus and Livilla. His mother, Antonia, may have had two children who died young. His maternal grandparents were Mark Antony and Octavia Minor, Augustus sister and his paternal grandparents were Livia, Augustus third wife, and Tiberius Claudius Nero. During his reign, Claudius revived the rumor that his father Drusus was actually the son of Augustus. In 9 BC, his father Drusus unexpectedly died on campaign in Germania, Claudius was then left to be raised by his mother, who never remarried. When Claudius disability became evident, the relationship with his family turned sour, Antonia referred to him as a monster, and used him as a standard for stupidity. She seems to have passed her son off on his grandmother Livia for a number of years, Livia was a little kinder, but nevertheless often sent him short, angry letters of reproof. He was put under the care of a former mule-driver to keep him disciplined, under the logic that his condition was due to laziness, however, by the time he reached his teenage years his symptoms apparently waned and his family took some notice of his scholarly interests. In 7 AD, Livy was hired to tutor him in history and he spent a lot of his time with the latter and the philosopher Athenodorus

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Middle Ages
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In the history of Europe, the Middle Ages or Medieval Period lasted from the 5th to the 15th century. It began with the fall of the Western Roman Empire and merged into the Renaissance, the Middle Ages is the middle period of the three traditional divisions of Western history, classical antiquity, the medieval period, and the modern period. The medieval period is subdivided into the Early, High. Population decline, counterurbanisation, invasion, and movement of peoples, the large-scale movements of the Migration Period, including various Germanic peoples, formed new kingdoms in what remained of the Western Roman Empire. In the seventh century, North Africa and the Middle East—once part of the Byzantine Empire—came under the rule of the Umayyad Caliphate, although there were substantial changes in society and political structures, the break with classical antiquity was not complete. The still-sizeable Byzantine Empire survived in the east and remained a major power, the empires law code, the Corpus Juris Civilis or Code of Justinian, was rediscovered in Northern Italy in 1070 and became widely admired later in the Middle Ages. In the West, most kingdoms incorporated the few extant Roman institutions, monasteries were founded as campaigns to Christianise pagan Europe continued. The Franks, under the Carolingian dynasty, briefly established the Carolingian Empire during the later 8th, the Crusades, first preached in 1095, were military attempts by Western European Christians to regain control of the Holy Land from Muslims. Kings became the heads of centralised nation states, reducing crime and violence, intellectual life was marked by scholasticism, a philosophy that emphasised joining faith to reason, and by the founding of universities. Controversy, heresy, and the Western Schism within the Catholic Church paralleled the conflict, civil strife. Cultural and technological developments transformed European society, concluding the Late Middle Ages, the Middle Ages is one of the three major periods in the most enduring scheme for analysing European history, classical civilisation, or Antiquity, the Middle Ages, and the Modern Period. Medieval writers divided history into periods such as the Six Ages or the Four Empires, when referring to their own times, they spoke of them as being modern. In the 1330s, the humanist and poet Petrarch referred to pre-Christian times as antiqua, leonardo Bruni was the first historian to use tripartite periodisation in his History of the Florentine People. Bruni and later argued that Italy had recovered since Petrarchs time. The Middle Ages first appears in Latin in 1469 as media tempestas or middle season, in early usage, there were many variants, including medium aevum, or middle age, first recorded in 1604, and media saecula, or middle ages, first recorded in 1625. The alternative term medieval derives from medium aevum, tripartite periodisation became standard after the German 17th-century historian Christoph Cellarius divided history into three periods, Ancient, Medieval, and Modern. The most commonly given starting point for the Middle Ages is 476, for Europe as a whole,1500 is often considered to be the end of the Middle Ages, but there is no universally agreed upon end date. English historians often use the Battle of Bosworth Field in 1485 to mark the end of the period

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Roman numerals
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The numeric system represented by Roman numerals originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers in this system are represented by combinations of letters from the Latin alphabet, Roman numerals, as used today, are based on seven symbols, The use of Roman numerals continued long after the decline of the Roman Empire. The numbers 1 to 10 are usually expressed in Roman numerals as follows, I, II, III, IV, V, VI, VII, VIII, IX, Numbers are formed by combining symbols and adding the values, so II is two and XIII is thirteen. Symbols are placed left to right in order of value. Named after the year of its release,2014 as MMXIV, the year of the games of the XXII Olympic Winter Games The standard forms described above reflect typical modern usage rather than a universally accepted convention. Usage in ancient Rome varied greatly and remained inconsistent in medieval, Roman inscriptions, especially in official contexts, seem to show a preference for additive forms such as IIII and VIIII instead of subtractive forms such as IV and IX. Both methods appear in documents from the Roman era, even within the same document, double subtractives also occur, such as XIIX or even IIXX instead of XVIII. Sometimes V and L are not used, with such as IIIIII. Such variation and inconsistency continued through the period and into modern times. Clock faces that use Roman numerals normally show IIII for four o’clock but IX for nine o’clock, however, this is far from universal, for example, the clock on the Palace of Westminster in London uses IV. Similarly, at the beginning of the 20th century, different representations of 900 appeared in several inscribed dates. For instance,1910 is shown on Admiralty Arch, London, as MDCCCCX rather than MCMX, although Roman numerals came to be written with letters of the Roman alphabet, they were originally independent symbols. The Etruscans, for example, used

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Babylonian numerals
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Babylonian numerals were written in cuneiform, using a wedge-tipped reed stylus to make a mark on a soft clay tablet which would be exposed in the sun to harden to create a permanent record. The Babylonians, who were famous for their observations and calculations. Neither of the predecessors was a positional system and this system first appeared around 2000 BC, its structure reflects the decimal lexical numerals of Semitic languages rather than Sumerian lexical numbers. However, the use of a special Sumerian sign for 60 attests to a relation with the Sumerian system. The Babylonian system is credited as being the first known positional numeral system and this was an extremely important development, because non-place-value systems require unique symbols to represent each power of a base, which can make calculations more difficult. Only two symbols were used to notate the 59 non-zero digits and these symbols and their values were combined to form a digit in a sign-value notation quite similar to that of Roman numerals, for example, the combination represented the digit for 23. A space was left to indicate a place value, similar to the modern-day zero. Babylonians later devised a sign to represent this empty place and they lacked a symbol to serve the function of radix point, so the place of the units had to be inferred from context, could have represented 23 or 23×60 or 23×60×60 or 23/60, etc. A common theory is that 60, a highly composite number, was chosen due to its prime factorization, 2×2×3×5, which makes it divisible by 1,2,3,4,5,6,10,12,15,20. Integers and fractions were represented identically — a radix point was not written, the Babylonians did not technically have a digit for, nor a concept of, the number zero. Although they understood the idea of nothingness, it was not seen as a number—merely the lack of a number, what the Babylonians had instead was a space to mark the nonexistence of a digit in a certain place value. Babylon Babylonia History of zero Numeral system Menninger, Karl W. Number Words and Number Symbols, Number, From Ancient Civilisations to the Computer. CESCNC - a handy and easy-to use numeral converter

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Latin
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Latin is a classical language belonging to the Italic branch of the Indo-European languages. The Latin alphabet is derived from the Etruscan and Greek alphabets, Latin was originally spoken in Latium, in the Italian Peninsula. Through the power of the Roman Republic, it became the dominant language, Vulgar Latin developed into the Romance languages, such as Italian, Portuguese, Spanish, French, and Romanian. Latin, Italian and French have contributed many words to the English language, Latin and Ancient Greek roots are used in theology, biology, and medicine. By the late Roman Republic, Old Latin had been standardised into Classical Latin, Vulgar Latin was the colloquial form spoken during the same time and attested in inscriptions and the works of comic playwrights like Plautus and Terence. Late Latin is the language from the 3rd century. Later, Early Modern Latin and Modern Latin evolved, Latin was used as the language of international communication, scholarship, and science until well into the 18th century, when it began to be supplanted by vernaculars. Ecclesiastical Latin remains the language of the Holy See and the Roman Rite of the Catholic Church. Today, many students, scholars and members of the Catholic clergy speak Latin fluently and it is taught in primary, secondary and postsecondary educational institutions around the world. The language has been passed down through various forms, some inscriptions have been published in an internationally agreed, monumental, multivolume series, the Corpus Inscriptionum Latinarum. Authors and publishers vary, but the format is about the same, volumes detailing inscriptions with a critical apparatus stating the provenance, the reading and interpretation of these inscriptions is the subject matter of the field of epigraphy. The works of several hundred ancient authors who wrote in Latin have survived in whole or in part and they are in part the subject matter of the field of classics. The Cat in the Hat, and a book of fairy tales, additional resources include phrasebooks and resources for rendering everyday phrases and concepts into Latin, such as Meissners Latin Phrasebook. The Latin influence in English has been significant at all stages of its insular development. From the 16th to the 18th centuries, English writers cobbled together huge numbers of new words from Latin and Greek words, dubbed inkhorn terms, as if they had spilled from a pot of ink. Many of these words were used once by the author and then forgotten, many of the most common polysyllabic English words are of Latin origin through the medium of Old French. Romance words make respectively 59%, 20% and 14% of English, German and those figures can rise dramatically when only non-compound and non-derived words are included. Accordingly, Romance words make roughly 35% of the vocabulary of Dutch, Roman engineering had the same effect on scientific terminology as a whole

32.
Arabic numerals
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In this numeral system, a sequence of digits such as 975 is read as a single number, using the position of the digit in the sequence to interpret its value. The symbol for zero is the key to the effectiveness of the system, the system was adopted by Arab mathematicians in Baghdad and passed on to the Arabs farther west. There is some evidence to suggest that the numerals in their current form developed from Arabic letters in the Maghreb, the current form of the numerals developed in North Africa, distinct in form from the Indian and eastern Arabic numerals. The use of Arabic numerals spread around the world through European trade, books, the term Arabic numerals is ambiguous. It most commonly refers to the widely used in Europe. Arabic numerals is also the name for the entire family of related numerals of Arabic. It may also be intended to mean the numerals used by Arabs and it would be more appropriate to refer to the Arabic numeral system, where the value of a digit in a number depends on its position. The decimal Hindu–Arabic numeral system was developed in India by AD700, the development was gradual, spanning several centuries, but the decisive step was probably provided by Brahmaguptas formulation of zero as a number in AD628. The system was revolutionary by including zero in positional notation, thereby limiting the number of digits to ten. It is considered an important milestone in the development of mathematics, one may distinguish between this positional system, which is identical throughout the family, and the precise glyphs used to write the numerals, which varied regionally. The glyphs most commonly used in conjunction with the Latin script since early modern times are 0123456789. The first universally accepted inscription containing the use of the 0 glyph in India is first recorded in the 9th century, in an inscription at Gwalior in Central India dated to 870. Numerous Indian documents on copper plates exist, with the symbol for zero in them, dated back as far as the 6th century AD. Inscriptions in Indonesia and Cambodia dating to AD683 have also been found and their work was principally responsible for the diffusion of the Indian system of numeration in the Middle East and the West. In the 10th century, Middle-Eastern mathematicians extended the decimal system to include fractions. The decimal point notation was introduced by Sind ibn Ali, who wrote the earliest treatise on Arabic numerals. Ghubar numerals themselves are probably of Roman origin, some popular myths have argued that the original forms of these symbols indicated their numeric value through the number of angles they contained, but no evidence exists of any such origin. In 825 Al-Khwārizmī wrote a treatise in Arabic, On the Calculation with Hindu Numerals, Algoritmi, the translators rendition of the authors name, gave rise to the word algorithm

33.
0 (number)
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0 is both a number and the numerical digit used to represent that number in numerals. The number 0 fulfills a role in mathematics as the additive identity of the integers, real numbers. As a digit,0 is used as a placeholder in place value systems, names for the number 0 in English include zero, nought or naught, nil, or—in contexts where at least one adjacent digit distinguishes it from the letter O—oh or o. Informal or slang terms for zero include zilch and zip, ought and aught, as well as cipher, have also been used historically. The word zero came into the English language via French zéro from Italian zero, in pre-Islamic time the word ṣifr had the meaning empty. Sifr evolved to mean zero when it was used to translate śūnya from India, the first known English use of zero was in 1598. The Italian mathematician Fibonacci, who grew up in North Africa and is credited with introducing the system to Europe. This became zefiro in Italian, and was contracted to zero in Venetian. The Italian word zefiro was already in existence and may have influenced the spelling when transcribing Arabic ṣifr, modern usage There are different words used for the number or concept of zero depending on the context. For the simple notion of lacking, the words nothing and none are often used, sometimes the words nought, naught and aught are used. Several sports have specific words for zero, such as nil in football, love in tennis and it is often called oh in the context of telephone numbers. Slang words for zero include zip, zilch, nada, duck egg and goose egg are also slang for zero. Ancient Egyptian numerals were base 10 and they used hieroglyphs for the digits and were not positional. By 1740 BC, the Egyptians had a symbol for zero in accounting texts. The symbol nfr, meaning beautiful, was used to indicate the base level in drawings of tombs and pyramids. By the middle of the 2nd millennium BC, the Babylonian mathematics had a sophisticated sexagesimal positional numeral system, the lack of a positional value was indicated by a space between sexagesimal numerals. By 300 BC, a symbol was co-opted as a placeholder in the same Babylonian system. In a tablet unearthed at Kish, the scribe Bêl-bân-aplu wrote his zeros with three hooks, rather than two slanted wedges, the Babylonian placeholder was not a true zero because it was not used alone

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Renaissance
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The Renaissance was a period in European history, from the 14th to the 17th century, regarded as the cultural bridge between the Middle Ages and modern history. It started as a movement in Italy in the Late Medieval period and later spread to the rest of Europe. This new thinking became manifest in art, architecture, politics, science, Early examples were the development of perspective in oil painting and the recycled knowledge of how to make concrete. Although the invention of movable type sped the dissemination of ideas from the later 15th century. In politics, the Renaissance contributed to the development of the customs and conventions of diplomacy, the Renaissance began in Florence, in the 14th century. Other major centres were northern Italian city-states such as Venice, Genoa, Milan, Bologna, the word Renaissance, literally meaning Rebirth in French, first appeared in English in the 1830s. The word also occurs in Jules Michelets 1855 work, Histoire de France, the word Renaissance has also been extended to other historical and cultural movements, such as the Carolingian Renaissance and the Renaissance of the 12th century. The Renaissance was a movement that profoundly affected European intellectual life in the early modern period. Renaissance scholars employed the humanist method in study, and searched for realism, however, a subtle shift took place in the way that intellectuals approached religion that was reflected in many other areas of cultural life. In addition, many Greek Christian works, including the Greek New Testament, were back from Byzantium to Western Europe. Political philosophers, most famously Niccolò Machiavelli, sought to describe life as it really was. Others see more competition between artists and polymaths such as Brunelleschi, Ghiberti, Donatello, and Masaccio for artistic commissions as sparking the creativity of the Renaissance. Yet it remains much debated why the Renaissance began in Italy, accordingly, several theories have been put forward to explain its origins. During the Renaissance, money and art went hand in hand, Artists depended entirely on patrons while the patrons needed money to foster artistic talent. Wealth was brought to Italy in the 14th, 15th, and 16th centuries by expanding trade into Asia, silver mining in Tyrol increased the flow of money. Luxuries from the Eastern world, brought home during the Crusades, increased the prosperity of Genoa, unlike with Latin texts, which had been preserved and studied in Western Europe since late antiquity, the study of ancient Greek texts was very limited in medieval Western Europe. One of the greatest achievements of Renaissance scholars was to bring this entire class of Greek cultural works back into Western Europe for the first time since late antiquity, Arab logicians had inherited Greek ideas after they had invaded and conquered Egypt and the Levant. Their translations and commentaries on these ideas worked their way through the Arab West into Spain and Sicily and this work of translation from Islamic culture, though largely unplanned and disorganized, constituted one of the greatest transmissions of ideas in history

35.
Common Era
–
Common Era or Current Era is a year-numbering system for the Julian and Gregorian calendars that refers to the years since the start of this era, i. e. since AD1. The preceding era is referred to as before the Common or Current Era, the Current Era notation system can be used as a secular alternative to the Dionysian era system, which distinguishes eras as AD and BC. The two notation systems are equivalent, thus 2017 CE corresponds to AD2017 and 400 BCE corresponds to 400 BC. The year-numbering system for the Gregorian calendar is the most widespread civil calendar used in the world today. For decades, it has been the standard, recognized by international institutions such as the United Nations. The expression has been traced back to Latin usage to 1615, as vulgaris aerae, the term Common Era can be found in English as early as 1708, and became more widely used in the mid-19th century by Jewish academics. He attempted to number years from a reference date, an event he referred to as the Incarnation of Jesus. Dionysius labeled the column of the table in which he introduced the new era as Anni Domini Nostri Jesu Christi, numbering years in this manner became more widespread in Europe with its usage by Bede in England in 731. Bede also introduced the practice of dating years before what he supposed was the year of birth of Jesus, in 1422, Portugal became the last Western European country to switch to the system begun by Dionysius. The first use of the Latin term vulgaris aerae discovered so far was in a 1615 book by Johannes Kepler, Kepler uses it again in a 1616 table of ephemerides, and again in 1617. A1635 English edition of that book has the title page in English – so far, a 1701 book edited by John LeClerc includes Before Christ according to the Vulgar Æra,6. A1716 book in English by Dean Humphrey Prideaux says, before the beginning of the vulgar æra, a 1796 book uses the term vulgar era of the nativity. The first so-far-discovered usage of Christian Era is as the Latin phrase aerae christianae on the page of a 1584 theology book. In 1649, the Latin phrase æræ Christianæ appeared in the title of an English almanac, a 1652 ephemeris is the first instance so-far-found for English usage of Christian Era. The English phrase common Era appears at least as early as 1708, a 1759 history book uses common æra in a generic sense, to refer to the common era of the Jews. The first-so-far found usage of the phrase before the era is in a 1770 work that also uses common era and vulgar era as synonyms. The 1797 edition of the Encyclopædia Britannica uses the terms vulgar era, the Catholic Encyclopedia in at least one article reports all three terms being commonly understood by the early 20th century. Thus, the era of the Jews, the common era of the Mahometans, common era of the world

36.
Astronomer
–
An astronomer is a scientist in the field of astronomy who concentrates their studies on a specific question or field outside of the scope of Earth. They look at stars, planets, moons, comets and galaxies, as well as other celestial objects — either in observational astronomy. Examples of topics or fields astronomers work on include, planetary science, solar astronomy, there are also related but distinct subjects like physical cosmology which studies the Universe as a whole. Astronomers usually fit into two types, Observational astronomers make direct observations of planets, stars and galaxies, and analyze the data, theoretical astronomers create and investigate models of things that cannot be observed. They use this data to create models or simulations to theorize how different celestial bodies work, there are further subcategories inside these two main branches of astronomy such as planetary astronomy, galactic astronomy or physical cosmology. Today, that distinction has disappeared and the terms astronomer. Professional astronomers are highly educated individuals who typically have a Ph. D. in physics or astronomy and are employed by research institutions or universities. They spend the majority of their time working on research, although quite often have other duties such as teaching, building instruments. The number of astronomers in the United States is actually quite small. The American Astronomical Society, which is the organization of professional astronomers in North America, has approximately 7,000 members. This number includes scientists from other such as physics, geology. The International Astronomical Union comprises almost 10,145 members from 70 different countries who are involved in research at the Ph. D. level. Before CCDs, photographic plates were a method of observation. Modern astronomers spend relatively little time at telescopes usually just a few weeks per year, analysis of observed phenomena, along with making predictions as to the causes of what they observe, takes the majority of observational astronomers time. Astronomers who serve as faculty spend much of their time teaching undergraduate and graduate classes, most universities also have outreach programs including public telescope time and sometimes planetariums as a public service to encourage interest in the field. Those who become astronomers usually have a background in maths, sciences. Taking courses that teach how to research, write and present papers are also invaluable, in college/university most astronomers get a Ph. D. in astronomy or physics. Keeping in mind how few there are it is understood that graduate schools in this field are very competitive

37.
Integer
–
An integer is a number that can be written without a fractional component. For example,21,4,0, and −2048 are integers, while 9.75, 5 1⁄2, the set of integers consists of zero, the positive natural numbers, also called whole numbers or counting numbers, and their additive inverses. This is often denoted by a boldface Z or blackboard bold Z standing for the German word Zahlen, ℤ is a subset of the sets of rational and real numbers and, like the natural numbers, is countably infinite. The integers form the smallest group and the smallest ring containing the natural numbers, in algebraic number theory, the integers are sometimes called rational integers to distinguish them from the more general algebraic integers. In fact, the integers are the integers that are also rational numbers. Like the natural numbers, Z is closed under the operations of addition and multiplication, that is, however, with the inclusion of the negative natural numbers, and, importantly,0, Z is also closed under subtraction. The integers form a ring which is the most basic one, in the following sense, for any unital ring. This universal property, namely to be an object in the category of rings. Z is not closed under division, since the quotient of two integers, need not be an integer, although the natural numbers are closed under exponentiation, the integers are not. The following lists some of the properties of addition and multiplication for any integers a, b and c. In the language of algebra, the first five properties listed above for addition say that Z under addition is an abelian group. As a group under addition, Z is a cyclic group, in fact, Z under addition is the only infinite cyclic group, in the sense that any infinite cyclic group is isomorphic to Z. The first four properties listed above for multiplication say that Z under multiplication is a commutative monoid. However, not every integer has an inverse, e. g. there is no integer x such that 2x =1, because the left hand side is even. This means that Z under multiplication is not a group, all the rules from the above property table, except for the last, taken together say that Z together with addition and multiplication is a commutative ring with unity. It is the prototype of all objects of algebraic structure. Only those equalities of expressions are true in Z for all values of variables, note that certain non-zero integers map to zero in certain rings. The lack of zero-divisors in the means that the commutative ring Z is an integral domain

38.
Jacques Cassini
–
Jacques Cassini was a French astronomer, son of the famous Italian astronomer Giovanni Domenico Cassini. Cassini was born at the Paris Observatory, admitted at the age of seventeen to membership of the French Academy of Sciences, he was elected in 1696 a fellow of the Royal Society of London, and became maître des comptes in 1706. His two separate calculations for a degree of meridian arc were 57,097 toises de Paris and 57,061 toises, giving results for Earths radius of 3,271,420 toises and 3,269,297 toises, respectively. He published the first tables of the satellites of Saturn in 1716 and he died at Thury, near Clermont, France. The asteroid 24102 Jacquescassini is named after him, Jacques Cassini married Suzanne Françoise Charpentier de Charmois. Their second son was astronomer César-François Cassini de Thury, who was known as Cassini III. This article incorporates text from a now in the public domain, Chisholm, Hugh. OConnor, John J. Robertson, Edmund F. Jacques Cassini, MacTutor History of Mathematics archive, Jacques Cassini at the Mathematics Genealogy Project

39.
Jesus of Nazareth
–
Jesus, also referred to as Jesus of Nazareth or Jesus Christ, was a Jewish preacher and religious leader who became the central figure of Christianity. Christians believe him to be the Son of God and the awaited Messiah prophesied in the Old Testament, Jesus was a Galilean Jew who was baptized by John the Baptist and subsequently began his own ministry, preaching his message orally and often being referred to as rabbi. He was arrested and tried by the Jewish authorities, and was crucified by the order of Pontius Pilate, Jesus debated fellow Jews on how to best follow God, performed healings, taught in parables and gathered followers. After his death, his followers believed he rose from the dead, and his birth is celebrated annually on December 25 as a holiday known as Christmas, his crucifixion is honored on Good Friday, and his resurrection is celebrated on Easter. The widely used calendar era AD, from the Latin anno Domini, most Christians believe Jesus enables humans to be reconciled to God. The Nicene Creed asserts that Jesus will judge the living and the dead either before or after their bodily resurrection, the great majority of Christians worship Jesus as the incarnation of God the Son, the second of three persons of a Divine Trinity. A minority of Christian denominations reject Trinitarianism, wholly or partly, in Islam, Jesus is considered one of Gods important prophets and the Messiah. Muslims believe Jesus was a bringer of scripture and was born of a virgin but was not the Son of God, the Quran states that Jesus himself never claimed divinity. To most Muslims, Jesus was not crucified but was raised into Heaven by God. Judaism rejects the belief that Jesus was the awaited Messiah, arguing that he did not fulfill Messianic prophecies, a typical Jew in Jesus time had only one name, sometimes supplemented with the fathers name or the individuals hometown. Thus, in the New Testament, Jesus is commonly referred to as Jesus of Nazareth, Jesus neighbors in Nazareth refer to him as the carpenter, the son of Mary and brother of James and Joses and Judas and Simon, the carpenters son, or Josephs son. In John, the disciple Philip refers to him as Jesus son of Joseph from Nazareth, the name Jesus is derived from the Latin Iesus, a transliteration of the Greek Ἰησοῦς. The Greek form is a rendering of the Hebrew ישוע‎, a variant of the earlier name יהושע‎, the name Yeshua appears to have been in use in Judea at the time of the birth of Jesus. The 1st century works of historian Flavius Josephus, who wrote in Koine Greek, the etymology of Jesus name in the context of the New Testament is generally given as Yahweh is salvation. Since early Christianity, Christians have commonly referred to Jesus as Jesus Christ, the word Christ is derived from the Greek Χριστός, which is a translation of the Hebrew משיח, meaning the anointed and usually transliterated into English as Messiah. Christians designate Jesus as Christ because they believe he is the Messiah, whose arrival is prophesied in the Hebrew Bible, in postbiblical usage, Christ became viewed as a name—one part of Jesus Christ—but originally it was a title. The term Christian has been in use since the 1st century, the four canonical gospels are the only substantial sources for the life and message of Jesus. Acts of the Apostles refers to the ministry of Jesus

40.
Anno Mundi
–
Anno Mundi, abbreviated as AM or A. M. or Year After Creation, is a calendar era based on the biblical accounts of the creation of the world and subsequent history. That calendar is similar to the Julian calendar except that its epoch is equivalent to 1 September 5509 BC on the Julian proleptic calendar, the Hebrew calendar is based on rabbinic calculations of the year of creation from the Hebrew Masoretic text of the bible. This calendar is used within Jewish communities for religious and other purposes, on the Hebrew calendar, the day begins at sunset. The calendars epoch, corresponding to the date of the worlds creation, is equivalent to sunset on the Julian proleptic calendar date 6 October 3761 BC. The new year begins at Rosh Hashanah, roughly in September, Year anno mundi 5777, or AM5777, began at sunset on 2 October 2016 on the Gregorian calendar. While differences in biblical interpretation or in calculation methodology can produce differences in the creation date. The primary reason for the disparity seems to lie in which underlying Biblical text is chosen, most of the 1, 732-year difference resides in numerical discrepancies in the genealogies of the two versions of the Book of Genesis. The net difference between the two genealogies of Genesis is 1466 years, 85% of the total difference. During the Talmudic era, from the 1st to the 10th centuries AD, jews in these regions used Seleucid Era dating as the primary method for calculating the calendar year. Why not say that it is reckoned from the Exodus from Egypt, omitting the first thousand years, in that case, the document is really post-dated. Said Rav Nahman, In the Diaspora the Greek Era alone is used and he thought that Rav Nahman wanted to dispose of him anyhow, but when he went and studied it thoroughly he found that it is indeed taught, In the Diaspora the Greek Era alone is used. By his calculation, based on the Masoretic Text, Adam and Eve were created on 1st of Tishrei in 3760 BC, in the 8th and 9th centuries AD, the center of Jewish life moved from Babylonia to Europe, so calculations from the Seleucid era became meaningless. From the 11th century, anno mundi dating became dominant throughout most of the worlds Jewish communities, the new system reached its definitive form in AD1178 when Maimonides completed the Mishneh Torah. In the section Sanctification of the Moon, he wrote of his choice of Epoch, from which calculations of all dates should be made, which is the year 4938 of the creation of the world. He included all the rules for the calculated calendar epoch and their basis, including the modern epochal year in his work. The first year of the Jewish calendar, Anno Mundi 1, began one year before Creation. The first five days of Jewish Creation week occupy the last five days of AM1, the sixth day of Creation, when Adam and Eve were created, is the first day of AM2, Rosh Hashanah. Its associated molad Adam occurred on Day 5 at 14 hours and this is also called molad BaHaRaD, because it occurred on Day 2,5 hours,204 parts

0 A.D. (video game)
–
0 A. D. is a free, open-source, cross-platform real-time strategy game under development by Wildfire Games. It is a war and economy game focusing on the years between 500 B. C. and 1 B. C. for the first part. The game is cross-platform, playable on Windows, OS X, Linux, the game aims to be entirely free and open-source, using the GPL 2+ license for

2.
Screenshot of the Gaul Civilization with all of Pyrogenesis' graphical effects enabled.

3.
Screenshot of a Carthaginian town.

4.
Screenshot of Cycladic Archipelago island map

Anno Domini
–
The terms anno Domini and before Christ are used to label or number years in the Julian and Gregorian calendars. The term anno Domini is Medieval Latin and means in the year of the Lord, There is no year zero in this scheme, so the year AD1 immediately follows the year 1 BC. This dating system was devised in 525 by Dionysius Exiguus of Scythia Mino

1.
Dionysius Exiguus invented Anno Domini years to date Easter.

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Anno Domini inscription at a cathedral in Carinthia, Austria.

3.
Statue of Charlemagne by Agostino Cornacchini (1725), at St. Peter's Basilica, Vatican, Italy. Charlemagne promoted the usage of the Anno Domini epoch throughout the Carolingian Empire

Gregorian calendar
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The Gregorian calendar is internationally the most widely used civil calendar. It is named after Pope Gregory XIII, who introduced it in October 1582, the calendar was a refinement to the Julian calendar involving a 0. 002% correction in the length of the year. The motivation for the reform was to stop the drift of the calendar with respect to the

3.
First page of the papal bull Inter gravissimas

4.
Detail of the pope's tomb by Camillo Rusconi (completed 1723); Antonio Lilio is genuflecting before the pope, presenting his printed calendar.

Julian calendar
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The Julian calendar, proposed by Julius Caesar in 46 BC, was a reform of the Roman calendar. It took effect on 1 January 45 BC, by edict, the Julian calendar gains against the mean tropical year at the rate of one day in 128 years. For the Gregorian the figure is one day in 3,030 years, the difference in the average length of the year between Julia

1.
Russian icon of the Theophany (the baptism of Jesus by John the Baptist) (6 January), the highest-ranked feast which occurs on the fixed cycle of the Eastern Orthodox liturgical calendar.

2.
This is a visual example of the official date change from the Julian calendar to the Gregorian

3.
Key concepts

Buddhist calendar
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While the calendars share a common lineage, they also have minor but important variations such as intercalation schedules, month names and numbering, use of cycles, etc. In Thailand, the name Buddhist Era is a numbering system shared by the traditional Thai lunisolar calendar. The Southeast Asian lunisolar calendars are based on an older version of

1.
Thailand's version of the lunisolar Buddhist calendar

Hindu calendar
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Hindu calendar is a collective term for the various lunisolar calendars traditionally used in Hinduism. They adopt a similar underlying concept for timekeeping, but differ in their emphasis to moon cycle or the sun cycle, the names of months. A Hindu calendar is referred to as Panchanga. The ancient Hindu calendar is similar in design to the Jewish

1.
A page from the Hindu calendar 1871-72.

Scythia Minor
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The earliest description of the region is found in Herodotus, who identified as Scythia the region starting north of the Danube delta. During later times, the area also witnessed Celtic and Scythian invasions and it was part of the kingdom of Dacia for a period, after which the region was conquered by the Roman Empire, becoming part of the province

1.
Major towns and colonies in Scythia Minor. Shoreline ca. 1 CE

Dionysius Exiguus
–
Dionysius Exiguus (Latin for Dionysius the Humble, c. AD544 was a 6th-century monk born in Scythia Minor. He was a member of a community of Scythian monks concentrated in Tomis, Dionysius is best known as the inventor of the Anno Domini era, which is used to number the years of both the Gregorian calendar and the Julian calendar. Some churches ado

1.
Dionysius Exiguus.

Roman Emperor
–
The Roman emperor was the ruler of the Roman Empire during the imperial period. The emperors used a variety of different titles throughout history, often when a given Roman is described as becoming emperor in English, it reflects his taking of the title Augustus or Caesar. Another title often used was imperator, originally a military honorific, ear

1.
Augustus

2.
Vexillum

3.
Statue of Augustus, c. 30 BC–20 BC; this statue is located in the Louvre

4.
Imaginary portrait of Constantine XI, the last Roman emperor

Diocletian
–
Diocletian, born Diocles, was a Roman emperor from 284 to 305. Born to a family of low status in the Roman province of Dalmatia, after the deaths of Carus and his son Numerian on campaign in Persia, Diocletian was proclaimed emperor. The title was claimed by Carus other surviving son, Carinus. Diocletians reign stabilized the empire and marks the e

1.
Laureate head of Diocletian

2.
Antoninianus of Diocletian

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Panorama of amphitheatre in Salona

4.
Head of Carinus at the Centrale Montemartini

Diocletianic Persecution
–
The Diocletianic or Great Persecution was the last and most severe persecution of Christians in the Roman Empire. Later edicts targeted the clergy and ordered all inhabitants to sacrifice to the Roman gods, the persecution varied in intensity across the empire—weakest in Gaul and Britain, where only the first edict was applied, and strongest in the

1.
The Christian Martyrs' Last Prayer, by Jean-Léon Gérôme (1883)

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Head from a statue of Diocletian at the Istanbul Archaeological Museum

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Saint George before Diocletian. A 14th-century mural from Ubisi, Georgia. Christian tradition places the martyrdom of St. George, formerly a Roman army officer, in the reign of Diocletian.

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Map of the Roman Empire under the Tetrarchy, showing the dioceses and the four Tetrarchs' zones of influence.

Consulship
–
A consul was the highest elected political office of the Roman Republic, and the consulship was considered the highest level of the cursus honorum. Each year, two consuls were elected together, to serve for a one-year term, the consuls alternated in holding imperium each month, and a consuls imperium extended over Rome, Italy, and the provinces. Or

1.
A portrait of the three Consuls, Jean Jacques Régis de Cambacérès, Napoleon Bonaparte and Charles-François Lebrun (left to right)

Jesus Christ
–
Jesus, also referred to as Jesus of Nazareth or Jesus Christ, was a Jewish preacher and religious leader who became the central figure of Christianity. Christians believe him to be the Son of God and the awaited Messiah prophesied in the Old Testament, Jesus was a Galilean Jew who was baptized by John the Baptist and subsequently began his own mini

1.
(stained glass at St John's Ashfield in Sydney, Australia)

3.
A 3rd-century Greek papyrus of the Gospel of Luke

4.
Adoration of the Shepherds by Gerard van Honthorst, 1622.

Bede
–
He is well known as an author and scholar, and his most famous work, Ecclesiastical History of the English People gained him the title The Father of English History. Bedes monastery had access to a library which included works by Eusebius, Orosius. Almost everything that is known of Bedes life is contained in the last chapter of his Ecclesiastical

4.
Depiction of the Venerable Bede (on CLVIIIv) from the Nuremberg Chronicle, 1493

Historia ecclesiastica gentis Anglorum
–
It is believed to have been completed in 731 when Bede was approximately 59 years old. The Historia ecclesiastica gentis Anglorum, or An Ecclesiastical History of the English People is Bedes best-known work, the first of the five books begins with some geographical background and then sketches the history of England, beginning with Caesars invasion

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Folio 3v from the St Petersburg Bede

Roman calendar
–
The Roman calendar is the calendar used by the Roman kingdom and republic. The original calendar consisted of 10 months beginning in spring with March and these months ran for 38 nundinal cycles, each forming a kind of eight day week ended by religious rituals and a public market. The winter period was used to create January and February. The legen

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A fragment of the Fasti Praenestini for the month of April (Aprilis), showing the nundinal letters on the left edge

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Drawing of the fragmentary Fasti Antiates Maiores (ca. 60 BC), a Roman calendar from before the Julian reform, with the seventh and eighth months still named Quintilis ("QVI") and Sextilis ("SEX"), and the intercalary month ("INTER") in the far righthand column (see enlarged)

3.
Fragment of an imperial-age consular fasti, Museo Epigrafico, Rome

Week
–
A week is a time unit equal to seven days. It is the time period used for cycles of rest days in most parts of the world. The days of the week were named after the planets in the Roman era. In English, the names are Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday. ISO8601 includes the ISO week date system, a system for weeks with

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An Italian cameo bracelet representing the days of the week by their eponymous deities (mid-19th century, Walters Art Museum)

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Circular diagrams showing the division of the day and of the week, from a Carolingian ms. (Clm 14456 fol. 71r) of St. Emmeram Abbey. The week is divided into seven days, and each day into 96 puncta (quarter-hours), 240 minuta (tenths of an hour) and 960 momenta (40th parts of an hour).

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Soviet calendar 12 December 1937 (Below 12:) "Sixth day of the six-day week" ————————— "Election day for the Supreme Soviet of the USSR"

4.
Key concepts

Ecclesiastical Latin
–
Ecclesiastical Latin is the form of the Latin language used in the Roman Rite of the Latin Church of the Catholic Church for liturgical and other purposes. It is distinguished from Classical Latin by some variations, a simplified syntax. Ecclesiastical Latin is the language of the Holy See and the only surviving sociolect of spoken Latin. During th

Anno mundi
–
Anno Mundi, abbreviated as AM or A. M. or Year After Creation, is a calendar era based on the biblical accounts of the creation of the world and subsequent history. That calendar is similar to the Julian calendar except that its epoch is equivalent to 1 September 5509 BC on the Julian proleptic calendar, the Hebrew calendar is based on rabbinic cal

1.
A Jewish gravestone using the Year After Creation found just outside the Rotunda of Thessaloniki. (Anno Mundi) chronology

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The inscription over the Bevis Marks Synagogue, City of London, gives a year in Anno Mundi (5461) and Anno Domini (1701).

Creation myth
–
A creation myth is a symbolic narrative of how the world began and how people first came to inhabit it. While in popular usage the term often refers to false or fanciful stories, formally. Cultures generally regard their creation myths as true, in the society in which it is told, a creation myth is usually regarded as conveying profound truths, met

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The Creation (c. 1896–1902) by James Tissot

2.
In Maya religion, the dwarf was an embodiment of the Maize God 's helpers at creation.

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Brahmā, the Hindu deva of creation, emerges from a lotus risen from the navel of Viṣņu, who lies with Lakshmi on the serpent Ananta Shesha.

Adam (Bible)
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Adam is a figure from the Book of Genesis who is also mentioned in the New Testament, the deuterocanonical books, the Quran, the Book of Mormon, and the Book of Iqan. According to the myth of the Abrahamic religions, he was the first human. In the Genesis creation narratives, he was created by God, Christian churches differ on how they view Adams s

4.
William Blake 's color printing of God Judging Adam original composed in 1795. This print is currently held by the Tate Collection

Genesis creation narrative
–
The Genesis creation narrative is the creation myth of both Judaism and Christianity. Two creation stories are found in the first two chapters of the Book of Genesis. In the second story, God, now referred to by the personal name Yahweh, creates Adam, the first man, from dust and places him in the Garden of Eden, eve, the first woman, is created fr

Abraham
–
Abraham, originally Abram, is the first of the three patriarchs of Judaism. His story features in the texts of all the Abrahamic religions and Abraham plays a prominent role as an example of faith in Judaism, Christianity. The biblical narrative revolves around the themes of posterity and land, Abraham is called by God to leave the house of his fat

1.
The bosom of Abraham - medieval illustration from the Hortus deliciarum of Herrad of Landsberg (12th century)

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Depiction of the separation of Abraham and Lot by Wenceslaus Hollar.

Septuagint
–
The Septuagint is a Koine Greek translation of an Hebraic textual tradition that included certain texts which were later included in the canonical Hebrew Bible and other related texts which were not. As the primary Greek translation of the Old Testament, it is called the Greek Old Testament. This translation is quoted a number of times in the New T

1.
Fragment of a Septuagint: A column of uncial text from 1 Esdras in the Codex Vaticanus c. 325–350 CE, the basis of Sir Lancelot Charles Lee Brenton's Greek edition and English translation.

Eusebius of Caesarea
–
Eusebius of Caesarea, also known as Eusebius Pamphili, was a Greek historian of Christianity, exegete, and Christian polemicist. He became the bishop of Caesarea Maritima about 314 AD, together with Pamphilus, he was a scholar of the Biblical canon and is regarded as an extremely well learned Christian of his time. He wrote Demonstrations of the Go

1.
Eusebius in a modern imagining

2.
Eusebius's canon tables were often included in Early Medieval Gospel books

3.
Ministry of Jesus & Apostolic Age

Julius Caesar
–
Gaius Julius Caesar, known as Julius Caesar, was a Roman politician, general, and notable author of Latin prose. He played a role in the events that led to the demise of the Roman Republic. In 60 BC, Caesar, Crassus, and Pompey formed an alliance that dominated Roman politics for several years. Their attempts to power as Populares were opposed by t

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The Tusculum portrait, perhaps the only surviving statue created during Caesar's lifetime.

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Gaius Marius, Caesar's uncle

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Dictator Lucius Cornelius Sulla stripped Caesar of the priesthood.

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The extent of the Roman Republic in 40 BC after Caesar's conquests.

Claudius
–
Claudius was Roman emperor from 41 to 54. A member of the Julio-Claudian dynasty, he was the son of Drusus and he was born at Lugdunum in Gaul, the first Roman Emperor to be born outside Italy. Claudius infirmity probably saved him from the fate of other nobles during the purges of Tiberius and Caligulas reigns. His survival led to his being declar

3.
A coin of Herod of Chalcis, showing him with his brother Agrippa of Judaea crowning Claudius. British Museum.

4.
Claudius issued this denarius type to emphasize his clemency after Caligula's assassination. The depiction of the goddess Pax-Nemesis, representing subdued vengeance, would be used on the coins of many later emperors.

Middle Ages
–
In the history of Europe, the Middle Ages or Medieval Period lasted from the 5th to the 15th century. It began with the fall of the Western Roman Empire and merged into the Renaissance, the Middle Ages is the middle period of the three traditional divisions of Western history, classical antiquity, the medieval period, and the modern period. The med

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The Cross of Mathilde, a crux gemmata made for Mathilde, Abbess of Essen (973–1011), who is shown kneeling before the Virgin and Child in the enamel plaque. The body of Christ is slightly later. Probably made in Cologne or Essen, the cross demonstrates several medieval techniques: cast figurative sculpture, filigree, enamelling, gem polishing and setting, and the reuse of Classical cameos and engraved gems.

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A late Roman statue depicting the four Tetrarchs, now in Venice

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Coin of Theodoric

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Mosaic showing Justinian with the bishop of Ravenna, bodyguards, and courtiers

Roman numerals
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The numeric system represented by Roman numerals originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers in this system are represented by combinations of letters from the Latin alphabet, Roman numerals, as used today, are based on seven symbols, The use of Roman numerals co

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Entrance to section LII (52) of the Colosseum, with numerals still visible

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An inscription on Admiralty Arch, London. The number is 1910, for which MCMX would be more usual

Babylonian numerals
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Babylonian numerals were written in cuneiform, using a wedge-tipped reed stylus to make a mark on a soft clay tablet which would be exposed in the sun to harden to create a permanent record. The Babylonians, who were famous for their observations and calculations. Neither of the predecessors was a positional system and this system first appeared ar

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Numeral systems

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Babylonian numerals

Latin
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Latin is a classical language belonging to the Italic branch of the Indo-European languages. The Latin alphabet is derived from the Etruscan and Greek alphabets, Latin was originally spoken in Latium, in the Italian Peninsula. Through the power of the Roman Republic, it became the dominant language, Vulgar Latin developed into the Romance languages

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Latin inscription, in the Colosseum

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Julius Caesar 's Commentarii de Bello Gallico is one of the most famous classical Latin texts of the Golden Age of Latin. The unvarnished, journalistic style of this patrician general has long been taught as a model of the urbane Latin officially spoken and written in the floruit of the Roman republic.

Arabic numerals
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In this numeral system, a sequence of digits such as 975 is read as a single number, using the position of the digit in the sequence to interpret its value. The symbol for zero is the key to the effectiveness of the system, the system was adopted by Arab mathematicians in Baghdad and passed on to the Arabs farther west. There is some evidence to su

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Numeral systems

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Modern-day Arab telephone keypad with two forms of Arabic numerals: Western Arabic/European numerals on the left and Eastern Arabic numerals on the right

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The numerals used in the Bakhshali manuscript, dated between the 2nd century BC and the 2nd century AD.

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Woodcut showing the 16th century astronomical clock of Uppsala Cathedral, with two clockfaces, one with Arabic and one with Roman numerals.

0 (number)
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0 is both a number and the numerical digit used to represent that number in numerals. The number 0 fulfills a role in mathematics as the additive identity of the integers, real numbers. As a digit,0 is used as a placeholder in place value systems, names for the number 0 in English include zero, nought or naught, nil, or—in contexts where at least o

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Example of the early Greek symbol for zero (lower right corner) from a 2nd-century papyrus

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The number 605 in Khmer numerals, from the Sambor inscription (Saka era 605 corresponds to AD 683). The earliest known material use of zero as a decimal figure.

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The back of Olmec stela C from Tres Zapotes, the second oldest Long Count date discovered. The numerals 7.16.6.16.18 translate to September, 32 BC (Julian). The glyphs surrounding the date are thought to be one of the few surviving examples of Epi-Olmec script.

Renaissance
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The Renaissance was a period in European history, from the 14th to the 17th century, regarded as the cultural bridge between the Middle Ages and modern history. It started as a movement in Italy in the Late Medieval period and later spread to the rest of Europe. This new thinking became manifest in art, architecture, politics, science, Early exampl

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David, by Michelangelo (Accademia di Belle Arti, Florence) is a masterpiece of Renaissance and world art.

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Renaissance

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Leonardo da Vinci 's Vitruvian Man (c. 1490) shows clearly the effect writers of Antiquity had on Renaissance thinkers. Based on the specifications in Vitruvius ' De architectura (1st century BC), Leonardo tried to draw the perfectly proportioned man.

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Portrait of a young woman (c. 1480-85) (Simonetta Vespucci) by Sandro Botticelli

Common Era
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Common Era or Current Era is a year-numbering system for the Julian and Gregorian calendars that refers to the years since the start of this era, i. e. since AD1. The preceding era is referred to as before the Common or Current Era, the Current Era notation system can be used as a secular alternative to the Dionysian era system, which distinguishes

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Key concepts

Astronomer
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An astronomer is a scientist in the field of astronomy who concentrates their studies on a specific question or field outside of the scope of Earth. They look at stars, planets, moons, comets and galaxies, as well as other celestial objects — either in observational astronomy. Examples of topics or fields astronomers work on include, planetary scie

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The Astronomer by Johannes Vermeer

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Galileo is often referred to as the Father of modern astronomy

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Guy Consolmagno (Vatikan observatory), analyzing a meteorite, 2014

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Emily Lakdawalla at the Planetary Conference 2013

Integer
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An integer is a number that can be written without a fractional component. For example,21,4,0, and −2048 are integers, while 9.75, 5 1⁄2, the set of integers consists of zero, the positive natural numbers, also called whole numbers or counting numbers, and their additive inverses. This is often denoted by a boldface Z or blackboard bold Z standing

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Algebraic structure → Group theory Group theory

Jacques Cassini
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Jacques Cassini was a French astronomer, son of the famous Italian astronomer Giovanni Domenico Cassini. Cassini was born at the Paris Observatory, admitted at the age of seventeen to membership of the French Academy of Sciences, he was elected in 1696 a fellow of the Royal Society of London, and became maître des comptes in 1706. His two separate

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Jacques Cassini

Jesus of Nazareth
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Jesus, also referred to as Jesus of Nazareth or Jesus Christ, was a Jewish preacher and religious leader who became the central figure of Christianity. Christians believe him to be the Son of God and the awaited Messiah prophesied in the Old Testament, Jesus was a Galilean Jew who was baptized by John the Baptist and subsequently began his own mini

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On this diagram, subducting slabs are in blue, and continental margins and a few plate boundaries are in red. The blue blob in the cutaway section is the seismically imaged Farallon Plate, which is subducting beneath North America. The remnants of this plate on the Surface of the Earth are the Juan de Fuca Plate and Explorer plate in the Northwestern USA / Southwestern Canada, and the Cocos Plate on the west coast of Mexico.

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This schematic diagram of the rock cycle shows the relationship between magma and sedimentary, metamorphic, and igneous rock

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Geologic cross-section of Kittatinny Mountain. This cross-section shows metamorphic rocks, overlain by younger sediments deposited after the metamorphic event. These rock units were later folded and faulted during the uplift of the mountain.

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Antoninianus of Pacatianus, usurper of Roman emperor Philip in 248. It bears the legend ROMAE AETER[NAE] AN[NO] MIL[LESIMO] ET PRIMO, "To eternal Rome, in its one thousand and first year".

Anno Mundi
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Anno Mundi, abbreviated as AM or A. M. or Year After Creation, is a calendar era based on the biblical accounts of the creation of the world and subsequent history. That calendar is similar to the Julian calendar except that its epoch is equivalent to 1 September 5509 BC on the Julian proleptic calendar, the Hebrew calendar is based on rabbinic cal

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A Jewish gravestone using the Year After Creation found just outside the Rotunda of Thessaloniki. (Anno Mundi) chronology

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The inscription over the Bevis Marks Synagogue, City of London, gives a year in Anno Mundi (5461) and Anno Domini (1701).

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Stelae 12 and 13 from Monte Alban, provisionally dated to 500-400 BCE, showing what is thought to be one of the earliest calendric representations in Mesoamerica.

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The back of Stela C from Tres Zapotes, an Olmec archaeological site. This is the second oldest Long Count date yet discovered. The numerals 7.16.6.16.18 translate to September 1, 32 BCE (Gregorian). The glyphs surrounding the date are what is thought to be one of the few surviving examples of Epi-Olmec script.

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Detail showing three columns of glyphs from a portion of the 2nd century CE La Mojarra Stela 1. The left column gives a Long Count date of 8.5.16.9.7, or 156 CE. The two right columns visible are glyphs from the Epi-Olmec script.

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Maya numerals

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The back of Stela C from Tres Zapotes, an Olmec archaeological site. This is the second oldest Long Count date yet discovered. The numerals 7.16.6.16.18 translate to September 1, 32 BCE (Gregorian). The glyphs surrounding the date are what is thought to be one of the few surviving examples of Epi-Olmec script.